I appreciate the clarification. Something that could be affecting how QuickBooks Desktop is behaving is the .net framework that your system is operating on. If you're using a 4.8 .net framework, that could be what's causing some of the hangups with the program and its files as QuickBooks doesn't currently work on it. In these instances, I recommend contacting an IT professional or Microsoft support to see about uninstalling the 4.8 .net framework and replacing it with a lower version.

Otherwise, your best bet is to reach out to QuickBooks Desktop support using the information I shared above. With tools like a screen share session, agents are able to see what you're seeing to work with you to resolve issues.