Hi there, bpm3,

Great job for performing the clean install to stop QuickBooks from crashing.

A clean install fixes issues that keep you from opening your company file, display and template problems, and a few other situations. It also replaces the QuickBooks system files on your computer.

On the other hand, our Engineering Team has identified data file incompatibility issues between the old version and the new macOS Catalina. This includes data loss and crashes. You'll want to found out how to safely continue using QuickBooks Desktop for Mac on the operating system.

Feel free to read through this article for more details: Risk of data file corruption and data loss. It will tell you what action to require before installing macOS Catalina.

Let me know if you need additional information. Just click the Reply button, and I'll get back to you.