I called Intuit about this today after trying ALL the things in the first reply by MikiD (and then some). I could NOT get QuickBooks Premier 2020 to save or print to PDF or XPS files. My 2018 and 2019 versions were printing just fine. Every time I tried in 2020, the program would freeze and I would have to use Windows Task Manager to crash out of it.

It seems that on Friday, 6/12/2020, a Win 10 release went out that was in conflict with the save or print to PDF settings in QB 2020. The current work around, until Intuit gets an update figured out, is to remove your logo from your invoice (or form) template. Uncheck the "use logo" box in the template. I use a background image for my invoice too, and apparently that is fine, it's just the logo. 

Hope this helps someone else and saves them from HOURS of attempting to repair with other tools! Good luck!