Cannot read database

Cannot read database

Unfortunately I haven't had a decent opportunity of using Peakto yet havign a problem right from the start with the database.  It's taken a long time to catalogue my 600k+ photos which I stored on external SSD.  When upgrading to a new version and pointing the catalogue to the database, it does not open, it only goes to the home "Welcome to Peakto" with the icons.  I've done the OPTION on startup to ensure its pointing to the database of thumbnails (45Gb) and Peakto files.  Peakto says "No Versions" on the top of the screen.  I've also updated to the latest version but there is nothing.  Support seem to be taking quite a while to update my ticket and respond.  Any ideas what's going on ?