Straight from WinZip support! What an admission!
Mukesh Kumar (WinZip)
December 26, 2017, 05:03 EST
Those messages are being displayed by the Update Notifier feature. To end those messages, you will need to remove the "WinZip UN" string value in this key of each machine's registry:
With that string gone, Update Notifier will not start up after the computer is restarted.
For future installs, the best way to prevent this sort of marketing message is to prevent the "Update Notifier" feature from being installed. You would need to either edit the INSTALLUPDATENOTIFIER property in the MSI file so that it has the value "0" or make the same change by way of a command line similar to this:
msiexec /i winzipxxx-64.msi /qn INSTALLUPDATENOTIFIER=0
The "***" above should be replaced by the WinZip version number to match your MSI file.
Mukesh, WinZip Technical Support