Sorry if this is the wrong place to post this.

I read this support page

I found the Microsoft article you say is missing, look under "Important Notes" in the link below

"Many applications, files, and settings will migrate as part of the upgrade. However, some applications or settings may not migrate.
For antimalware applications, Windows will check to see if your antimalware subscription is current (not expired) and compatible during the upgrade.
If the antimalware application is compatible and current, your application will be preserved during the upgrade to Windows 10.
If the antimalware application is incompatible, Windows will uninstall your application while preserving your settings.
After upgrade is complete, if your antimalware provider has informed Microsoft that it has made a compatible version available for your active subscription, Windows will notify you to install the latest version available with the settings that were set prior to upgrade."

I am starting to see issues with this poor implementation by Microsoft, not sure what Spybot authors can do to help out.