I found out what was the issue.
The "Controlled Access Folder" in Windows 10 Pro was blocking any changes to any protected folder, and that included any Stardock folders.

When I turned it off, I was allowed to update Start10, and any other Stardock program (I made sure to turn it back on for security reasons.)


As shown, now Start10 is at the latest version, as of today, Sunday, June 16, 2019. And, Start10 is now working exactly just as I wanted it for my laptop, with no issues whatsoever.
So now, this case can now be closed.