Can't upgrade to Windows 10 Pro?

I have been trying to upgrade my Win10 Home to Pro because some new software I need to use won't run on Home. Every time I try to upgrade, it almost finishes and then says "We couldn’t complete the updates, Undoing changes" and restarts without installing. It doesn't get stuck like some stories I have read about. It just won't install. I have tried everything from Win Update Troubleshooter and clearing out the software distribution folder. Does anyone have any advice other than a format and install? Thanks in advance.