how do i place it in game directory?
The directory on the computer where you had put your game?? Normally some path like MrC\Corruption-v0.67\game\... .
- There you find the .rpyc files of the game. Of interest to you is
com.rpyc, copy it to store a save somewhere else.
- Place
UnRen there and start it, it is depacking the .rpyc files for you.
- Now you got a bunch of .rpy files, especially a
com.rpy file. Save it somewhere too.
- Copy com.rpy
from archive and replace the original file. You're done, now start the game.