I used QB19. If its relevant I also subscribed to QB payroll service for many years and cancelled it in 2022.

In the same QB10 app I also had a different company file for my personal expenses that I have used for many years. Each file had different PW's. The file for my personal expenses continues to work fine and it identifies the PW each time.

RecentyI I downloaded a trial version of QB24 try it out. My personal file transferred over and work on QB24 just fine, but the business file will not open either when I click on the link in my apps folder or if I open QB24 first then try to open company it is the same, it wont work. Now it will also not open the file in QB19 like it used to .