CYOP is now outdated so use AFOM and here are instructions on how to download AFOM
Step 1:Install the latest version to work with v1.1.063
Step 2:Patch the mod's xdelta file with data.win
Step 3:Put the editor_assets folder in appdata/roaming/pizzatower_gm2
Step 4:Once you get to the tower select menu press down to play CYOP/AFOM levels :)