[2.0.15] Can't go back to the 2.0.14 with a save from both 2.0.14 and 2.0.15

[JigSaW]

After updating to 2.0.15 I've caught a bug that makes the game pretty much unplayable (viewtopic.php?f=7&t=120154&p=634244) but can't downgrade to 2.0.14 (to continue playing) and go back to my old or current save: the current save from 2.0.15 simply isn't loading on 2.0.14 and the 2.0.14's save loads but with zero blueprints (simply cos the game has been updated to 2.0.15 once). Also the mere fact of me trying to do this completely reset all of my in-game achievements (I don't care about it but some people do).

[Genhis]

Thanks for the report. All things you describe work as intended. Save games, blueprint library and achievement data are not backward-compatible.