MSI 1625: This Installation Is Forbidden by System Policy – How to Unblock
Error 1625 means Group Policy, AppLocker or Software Restriction Policy is blocking msiexec. Find the rule, or move Home PCs to an edition that exposes it.
Avast setup error 0xC0070643: installation fails and rolls back every time
Avast error 0xC0070643 usually means another security product is still hooked into Windows. Read the cause and the correct order for a clean install.