Why didn't Windows 10 ever try to force itself onto my machine?
It seems that there is some problem with the windows update.
You can try fixing it with troubleshooter.
Another thing is the update cache and dumps, you can delete them by navigating to c:\windows\SoftwareDistribution and delete all files and folders.
Restart your PC and check for updates.
If it doesn't work, try media creation tool.
As you have aleady said that you are not interested in getting the update, still start it and select upgrade this pc it will check your system and report the problem.
You can then cancel the process.