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I've resurrected my version 6.22 and completing my game using that.





Why using 6.22 version if you said that all works with 6.3?
6.22 its a very old version and making your project with that version you will be limited and miss new great features for your game.

I dont see other reasons for your models dont work with 6.4 or 6.5 versions than the fact that you didnt installed correctly the templates or you messed up the models animations.