Worked for me!
I followed the first guide I found to downpatch from 1.5 to 1.4 through Steam so the mod would be compatible:
When you actually download the mod it contains two files: one is called "Assembly-CSharp-invulnerable-1432.dll" and the other is called "README.txt"
The text file has step-by-step instructions for installing the mod on Windows and Mac.
Basically you copy "Assembly-CSharp-invulnerable-1432.dll" to Hollow Knight's installation folder (the folder's full name is given in the instructions).There's a file already there called Assembly-CSharp; if you change the modded file's name to that, and the original to something different, the mod runs when you open the game.
I haven't turned the mod off yet, but since it just involves reverting the names of the files back I assume it works fine.
Just make sure that the modded file and the original file aren't both named "Assembly-CSharp.dll" because if you do the game won't open; it freaked me out a little when it happened to me but it was an easy fix.
If anyone knows how to find a mod that lets you toggle this one on or off in-game then please drop it in the comments.
frogsit
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