Basecamp re-install

My laptop crashed and I had to re-install Windows 7 (couldn't get it to run on Win 10 which it had been on - but that's another story).
Bottom line is I've re-installed Basecamp version 4.6.2. I have all the Garmin folders off the old drive on an external usb drive but can't get the old routes into the new version. When I try to open Garmin/Basecamp/Database/4.6/Alldata.gdb from the external usb drive I get "Status - Error, Details - Unsupported version" reported. Can anyone help me get all my Routes/Tracks back?

Thanks in anticipation