Fairly sure. Windirstat was able to account for all the memory in usage, and I could not see any large block that could be attributed to Windows.old.

Regarding the compact OS option,

I found the answer to that here at Ten Forums:
Compact OS - Compress or Uncompress Windows 10 - Windows 10 Forums

You don't have to guess about it, since you can click on "My System Specs". What you will see there is HP Stream 11 X360. It is different in important ways. It has an 11" screen. It has a...

I decided to commit to the Windows 10 upgrade and get rid of the Windows.old folder, which was very large. After I ran the System Files Cleanup option in Disk Cleanup, it reported that I could gain...