I have downloaded the older version of the game: download_depot 3008670 3008670 1278777716171617955

And when I've tried to mimic the movements demonstrated in some youtube videos I cannot for the life of me get it working. Could someone please explain what exactly needs to happen?

I've never been able to get it either so I just use pull on the swing thing I don't know what it's called to allow myself to sprint while crouched.

I'm not exactly sure what proacveturing is I think it's the walking in vents thing and so in that case you have to walk sideways in the vent and quickly uncrouch