MacOS – When I check for update in macOS, are the software from other sources checked for updates as well

It appears that some updates have others as prerequisites, and will not show up as available until the others are installed. Thus, Software Update makes a list of all eligible updates, then runs. If a subsequent update was also pending that was not eligible to be downloaded because its prerequisite has not not yet been installed, that update would not make the list. The subsequent check, however, would see if any new updates had been unlocked by the updates installed.

While I'm not abosultely sure, how achieved my result, but after a reboot the update for one app-store app is gone now. What I did:

• the following is tested on old Blackmagic Disk Speed Test.app (free from appstore), before my tests the app-store showing an available update for it.
• Right click on app, select Show package contents
• go to "Contents"

• Move the following files and folders to some backup place

  • _MASReceipt (folder)

• reboot

If that doesn't work, remove these additional items from the package contents: - _CodeSignature (folder) - CodeResources (alias)

Maybe it is not enough, (in my tests i did the following too), try:

• Go to Library (alt-click on Finder's Go menu, select Library)
• Caches
• move com.apple.appstore folder somewhere else(backup location)
• reboot

After the above steps, the AppStore don't showing the available update for the "Blackmagic Disk Speed Test.app".

Warning: all the above is tested only in one app, needs more testing, it is absolutely without any warranty and don't blame me when your computer will burns, gets grabbed by aliens or anything other...