0x80070652 and 0x80240016: another installation is already in progress
0x80070652 and 0x80240016 mean an installer or pending operation still holds the servicing lock. Clear the pending state, reboot, then install the update.
MSI 1618: Another Installation Is Already in Progress – Clearing the Lock
Error 1618 means a second msiexec transaction already holds the installer mutex. Identify the blocking setup or update task, end it safely and retry cleanly.
Error 1618 and a half finished Exchange CU: setup will not start again
Error 1618 blocks a retry because Windows Installer still thinks setup is running. Learn how to clear the stuck state and resume the Exchange CU.