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License Error ACT.11

ESET error ACT.11: this licence is already used on the maximum devices

12 min read Updated October 4, 2026 Antivirus & Endpoint Security

Fix it now

The subscription is valid and every seat on it is spoken for. ESET’s published wording for this condition is that there are more devices using the subscription than it allows. Nothing is wrong with the key – you either free a seat held by a device you no longer use, or increase the device count.

  1. Sign in at home.eset.com with the account that owns the subscription. If you are not the owner, this is where you stop and ask them – ESET’s own guidance is that the owner has to resolve it.
  2. Open the License Manager and look at the devices using the subscription. Count how many seats it has and which machines hold them.
  3. Identify anything that is a former PC, a rebuilt machine or a duplicate of the machine you are sitting at.
  4. Remove or deactivate that seat, which returns it to the pool.
  5. On this PC, open ESET, go to Help and support and activate again, either with the key or by signing in with the same ESET HOME account.
  6. If every listed device is real and in use, the subscription is genuinely too small – add device slots or move to a larger plan.

ESET also raises a possibility most guides skip: an overused subscription can mean you are a victim of software piracy or counterfeiting, and it publishes a route to identify and report a pirated subscription. If you bought a cheap key from an unfamiliar seller, check that before assuming old machines are to blame.

If activation completes and the device appears in the list, you are done. If the list is full of machines you recognise, the next section covers what to do about it.

Why it happens

A subscription is a pool of activation units. Each successful activation takes one and registers an installation against the subscription; removing or deactivating that device returns the unit. The service does not know that a machine was thrown away, so nothing comes back on its own. That is why a three-device subscription can be exhausted by one person who has reinstalled Windows three times.

ESET’s own page for this condition is short and worth reading exactly. It says there are more devices using this subscription than it allows, and it gives three routes: the owner removes or deactivates seats in the License Manager at home.eset.com; the reader reports a pirated subscription if the subscription looks counterfeit; or, if the reader is not the owner, they contact the owner so that person can resolve it. Nothing there is about the machine in front of you.

The piracy route is the one people skip and it deserves its place. ESET raises it because a key sold cheaply and resold many times produces exactly this symptom for every buyer after the first – the subscription is real, and it is being used by strangers. If your device list contains machines you have never seen, that is not a bug to work around by deleting entries; it is a purchase to take up with whoever sold it to you.

One caution on mechanism. ESET does not publish how it derives an installation identity, so claims that a disk swap or a motherboard change specifically creates a new entry are guesses. What is observable is that reinstalls and rebuilds frequently leave an old entry behind holding its seat – so treat the device list as the record and check it rather than reasoning about what should have happened.

Retired machines are still holding seats

You have this one if The device list in ESET HOME names computers you no longer own or recognise as current.

  1. In ESET HOME, open the License Manager and review every device entry against machines that still exist.
  2. Remove or deactivate the obsolete entries. Each one frees a unit.
  3. Re-activate this PC and confirm it appears in place of one you removed.

Give devices recognisable names when you activate them. A list of default machine names is impossible to audit two years later.

This machine was rebuilt and now counts twice

You have this one if The device list contains an entry with the same or a similar name to the PC in front of you, activated at an earlier date.

  1. Remove the older duplicate only – check the activation date before you delete anything.
  2. Activate this installation again.
  3. In future, deactivate ESET or remove the device in ESET HOME before wiping a machine, so the seat comes back on its own.

The subscription is being used by people it was not bought for

You have this one if The device list contains machines that belong to friends, relatives, colleagues – or nobody you can identify at all.

  1. If you recognise the machines, decide who the subscription is genuinely for and remove the rest.
  2. If you do not recognise them, follow ESET’s own route and report a pirated or counterfeit subscription rather than deleting entries repeatedly.
  3. Give people their own subscriptions rather than passing one key around, or buy one sized for everyone who needs cover.

Removing a device stops that machine updating at its next check. Tell people before you do it.

You are not the subscription owner

You have this one if You cannot see a License Manager, or the subscription belongs to a family member, an employer or a reseller.

  1. Contact the owner. ESET’s published guidance is that the owner resolves this through their ESET HOME account.
  2. Ask them to remove a seat, or to add device slots if everyone genuinely needs cover.
  3. Do not keep retrying activation on this PC in the meantime; it cannot succeed until a unit is free.

The subscription is simply smaller than your device count

You have this one if Every entry in the list is a real machine in daily use, and there are as many of them as the subscription permits.

  1. Add device slots to the existing subscription, which keeps one expiry date across all machines.
  2. Or buy a second subscription for the extra machines, accepting two renewal dates to manage.
  3. Activate the new capacity and confirm the seat count in ESET HOME has risen.

Full reference

What ESET publishes for this condition

Element ESET’s published wording
The condition There are more devices using this subscription than it allows
Subscription status Overused – more devices are using this subscription than allowed
Owner’s remedy Remove or deactivate seats through the License Manager at home.eset.com
If the subscription looks counterfeit Follow ESET’s article on identifying and reporting a pirated subscription
If you are not the owner Contact the subscription owner so they can resolve it

ACT.11, ACT.35, ACT.24 and ACT.37 are the numbers that appear while this happens, and ESET’s current online help publishes no meaning for any of them. That is normal for vendor-internal codes. The status in ESET HOME is what the product is acting on, and it is the thing to read.

Auditing the device list properly

  1. Open the License Manager in ESET HOME and list every device against the subscription.
  2. Mark each entry as current, retired, duplicate or unrecognised. Do this before deleting anything.
  3. Remove retired and duplicate entries first, keeping the most recent activation for any machine that appears twice.
  4. If unrecognised entries remain, stop and treat that as a purchase problem rather than housekeeping.
  5. Re-activate the machine in front of you and confirm the seat count is what you expect.

Virtual machines and cloned images

In a small office this is where the arithmetic quietly goes wrong. If a template is prepared with ESET already activated and then deployed several times, each clone either claims its own seat or reports an identity the licensing service has already seen. Activate after deployment rather than before and the count stays honest. The same applies to test virtual machines that get rebuilt every few weeks – each rebuild is a fresh activation unless the old one was deactivated first.

How many devices you actually have

ESET sells its home plans in device tiers – HOME Security Essential, Premium and Ultimate all come in different device counts, and Ultimate publishes a higher allowance for its VPN than for the security seats. Do not work from a number you remember from a previous purchase; the seat count attached to your subscription is shown against it in ESET HOME and that is the only figure that governs activation.

Before you add slots

  • Confirm every entry in the list is a machine that still exists and still needs cover.
  • Confirm none of them is a duplicate of another.
  • Confirm none of them belongs to somebody outside the terms of the subscription.
  • Check the renewal date. Adding slots to a subscription with a month left is a different calculation from adding them to one with a year.
  • Check whether the same machines could be covered by a single larger plan rather than two subscriptions with separate renewal dates.

What removing a seat costs the other machine

It stops updating at its next subscription check, and it stops being able to reactivate with that subscription. That is not immediate and it is not dramatic, but it is real – so if the machine you are freeing a seat from is still in use by somebody, tell them first and give them somewhere to go. Deactivating from within the product on that machine is tidier than deleting the entry from underneath it.

When a licence is the actual fix

When every seat belongs to a machine you actually use, this is not a fault to troubleshoot – the subscription is the wrong size for the estate, and freeing a seat just moves the problem to whichever computer loses out. Extra device slots on the existing subscription are usually the tidy answer, because the term and renewal date stay aligned across every machine instead of drifting into separate anniversaries. Arco can look at your current ESET subscription, tell you what it costs to extend it to the device count you need, and confirm whether extending or buying a second subscription makes more sense for the number of machines you are adding. Do the audit first, though: the commonest version of this problem is three real machines, a three-device subscription, and two old laptops still holding units. And if the device list contains machines you do not recognise, that is ESET’s own piracy route rather than a purchase decision – take it up with whoever sold you the key.

Every code this article covers

Code What it points at Source
ACT.11 Raised when activation is refused because the subscription is overused. ESET’s current online help publishes no meaning for the code; the condition it documents is that more devices are using the subscription than it allows not published by the vendor
ACT.35 A neighbouring seat or capacity refusal. No published meaning not published by the vendor
ACT.24 An activation-family refusal where the request is declined rather than the key rejected. No published meaning not published by the vendor
ACT.37 Another activation-family refusal handled the same way: check capacity and status in ESET HOME, then re-activate not published by the vendor

Confirm the fix worked

  1. The ESET home screen reports protection as active with no activation warning.
  2. ESET HOME lists this PC against the subscription with today’s activation date.
  3. The subscription status in ESET HOME reads Active rather than Overused.
  4. The seat count shown matches the number of devices you intend to run.
  5. Update completes on this machine and the detection engine refreshes.

Questions people ask about this

Does uninstalling ESET free the seat automatically?

Do not rely on it. Remove or deactivate the device in ESET HOME and confirm the seat count changed. An uninstall that goes wrong, or a machine that is simply wiped, leaves the entry behind holding its unit.

The device list has machines I have never seen. What now?

Do not just delete them. ESET raises this case itself: an overused subscription can mean you are a victim of software piracy or counterfeiting, and it publishes a route to identify and report a pirated subscription. That is a purchase problem, not a housekeeping one.

Can I move a subscription to a new PC?

Yes. Remove or deactivate the old device in ESET HOME to return its unit, then activate on the new machine with the same key or account. That is a supported move and costs nothing.

What if I am not the subscription owner?

Then you cannot fix this yourself, and ESET says so: the owner resolves it through their ESET HOME account. Ask them to free a seat or add device slots rather than retrying activation on your machine.

Do phones and Macs use the same seats as PCs?

On a multi-device plan the pool is shared across the platforms the subscription covers, so a tablet quietly activated last year can be the seat you are looking for. Read the device list rather than counting the computers you can see from where you are sitting.

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