just walk into it, look upwards (or any direction you want to travel by ladder) and press forward key (default W)
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if you cant climb the ladder then you have to get it patched.
In order to climb up a ladder, walk up to it and look up. Your character will automatically ascend up the ladder.
Just go near a ladder and press W to move forward then TA-DA! Your climbing a ladder
Brodie tells me you just go by the ladder and push up
you have to go in the secret door when you climb the ladder at the top