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I have no clue how to do that can you elaborate please?

Open the folder for 4.51 and open the folder for 0.51, drag everything from 0.51 over to 4.51 it will ask you if you want to replace duplicate files check the box that says yes to all and click yes. you should be good to go

I did that it it still did not work for me. The game ran, but when I re-loaded my last game file save it just crashed out back to the beginning.