I had the same popup error message. Tried uninstalling and reinstalling the desktop version and it still came back. Was just about to purchase the cloud version of Quickbooks, but I think I fixed the problem. When the popup appears, open the task manager on windows (control alt delete - task manager). Look for the app called QBE, right click to open file location (on my computer it was in libraries/public) and delete the file. You'll have to end the task in task manager before you can delete the file - it'll appear in two places, also in background tasks - end both. Quickbooks will close. You should then be able to delete the file. It's a small file, but as we all know, it's insidious.