JustinDaveC,

Thanks for your reply. I cannot even open the QB Pro 2017 program as I always did by double clicking on the icon, or going into the start menu & clicking "open". When I tried to use your email to get the QuickbooksToolHub, the download attempt fails & I get a message that "QuickbooksToolHub.exe was blocked because this type of file can harm your device". I have Windows 10 Home, so, if your compatible OS list is  correct, it should work (as it always did for many years since I have had this computer). As far as I know, nothing has changed in my computer: perhaps there was an automatic Windows update?? Any suggestions on what might have caused the QBPro 2017 to stop opening? Any idea on how to get it to work again? Thanks.