Thank you. I followed your direction. Downloaded Enpass and reinstalled. The installation is 6.5.1. It opens normally, I have all my records. But instantly it tells me there's an update available. I updated to 6.5.2 then lost functionality to open just like my original message. I could only open with Run as Administrator.
I deleted, reinstalled 6.5.1. I can work normally now, so I guess I cannot upgrade to 6.5.2 because of this bug.