BASICALLY CORRECT - HERE IS THE FULL DETAILED SOLUTION:   I talked with the tech-wizzards at Intuit, and solved this.  You are basically correct.  However BEFORE reinstalling the software from scratch, you first need to backup your data file to protect all your work. I know this from personal experience.   In ProSeries 2021 the file name is 21Data.  In ProSeries Basic Edition 2021 the file name is 21Data also, the same name.  First backing up this file, for whatever software you use, is vitally important.  The Intuit tech-wizzard and I then proceeded to reinstall the software from scratch.  I had a lot of clients, so it was taking a long of time.  After a very long time waiting, we grew impatient,  seeing nothing happening, the tech-wizzard & I decided for us to restart the program.  Well, it; turned out that we did not wait long enough and I was missing 50 of my clients in my client list.  This would have been a major problem for sure if I did not first backup the data file.  So I simply replaced the data file with the backed-up file within the software.  Went back into the program and the full client list was then restored with no work and no clients missing.  Also, all the forms within the software was now e-ffile ready.