We've had a few license warnings for Avast Business Antivirus Cloudcare recently. Usually when upgrading, eg from Cloudcare 4.2.x to 4.3.0. To fix the licence warning you usually need to uninstall the current version, reboot and reinstall the latest. Even then it doesn't always work and using avastclear, the official uninstaller program from Avast / AVG is the way to go. Note that this should be run from Safe Mode.
"The stub cannot run installer / updater executable 'c:\users\ \appdata\local\temp\_av_iup.tm~
\instup.exe' (code 0x10b)"
Took a while to work this out - you need to be logged into Safe Mode as the local administrator, not a domain admin account.
Then the uninstall will run and reboot.
15/10/18 Update - also seen this warning with some sort of permission issue, had to move the avastclear program to another directory, eg c:\temp or c:\windows\temp
9/12/18 Update - Permission issue if you downloaded as the domain user then switched to local, try making a copy of avastclear and run that instead