.50 is rpg maker ace, and ver .58 .59 are RPG Maker MV, which is completely different, there is not much of a way to use ACE saved games with RPG Maker MV.
so using the cheat in the clothing spot of the game is best way to maybe help catch up, but ultimately you will need to start a new game with the newer version. (If you are using sae game editer I guess you could maybe edit all the variables and items to the same as your last game, but many of those variable will not show up until they are activated, so I doubt that would work, but it might? )