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When you put it that way maybe not. I get confused with the steam library part.

Whats the nuclear throne directory?

It's the directory where nuclearthrone.exe resides (together will all other game files)

So I drop it in there?

Yes? (you could try and report back if there's an error)

How do I run the NTT assemble?

You double-click the NTT-Assemble executable that you extracted with the rest of the files to the game directory

Then you press the recommended key, on your keyboard

I might need a video turtorial