What is the latest download of Mctivia? When I go to their website I only see Windows 8 compatible. Is Windows Pro the download in question that is compatible with Windows 10?
The latest version is V18.104.22.168 and it's listed as being compatible with Windows 8 only, but the software is working just fine in Windows 10. I recommend to download that version, then simply right click it and select Run as Administrator.
Note: There is no other tweak related about this to make the software work on Windows 10.