Hmm, unfortunately we haven’t put the time into fully documenting the best practice for migrating from Airtime 2.5 to LibreTime. This is on our todo list. In theory the database should update but it is possible that some of the upgrade.sql applications aren’t being applied properly which is what Itcrowdsource ran into. We were able to help get him going with some manual troubleshooting. We would like to get it working in terms of a straight upgrade from 2.5.
I am not 100% sure if you can do a fresh install and then just import the airtime 2.5 data without running into any issues, you could certainly try it. Please share any issues you run into when trying to update on this github issue which is where we are trying to document the best update process. Ideally we would love there to be a symbol upgrade from Airtime 2.5.x when we launch our beta version but this seems a long way off due to time limitations amongst the existing dev team. We are still chugging away at this goal though.