Really? Oh dear oh my. Want me to hold your hand for these trying times? Go google your sorrows away. Im not here to jiggle your ungrateful goon balls.
Post errors, describe your problem. If I see you type shit like "i doesn't work" i call in the mods to wack your moronic ass away.
Explanations below is for people having this issue but nothing works
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Failure to load mono is specifically tied to executable missing files to execute sequence. MEANING your folder is messed up or missing files of the game.
Solutions
1.Path problem due to system limitations.
Reduce letters in the folder name. And also not putting folder deep into subfolders.
Example
D:\SteamLibrary
D:\SteamLibrary\steamapps\workshop\content\4\3
2.Unzipping issue
Use 7-zip and EXTRACT to desirable location. Do not drag and copy.
If you drag and copy. Windows extracts content, put them into
temp file in hidden folder AppData, and then copy from there to whatever location you dragged it onto.
Multiple issues with this one. Windows Defender blocking and deleting files without you even noticing. More severe, not copying everything correctly either because lack of memory space - ESPECIALLY if you laptop/PC is old, your HDD/SDD may contain bad sectors which make bits of bytes UNREADABLE AND DAMAGED.
3.Bad upload. Or download.
Sometimes, you do not download file entirely for various reasons. Not gonna explain why. Google it.
Re-download. Or use different download client if issues persist.
And sometimes OP simply uploads faulty product.
If nothing helps. GOOGLE YOUR ISSUE. Survive and adapt.