Grimrock

If you have the standalone (like me), then you will DL your dungeons from nexusmods, (links in a "completed dungeons" sticky thread at the top of this forum).Simply unzip them into your "Documents\Almost Human\Legend of Grimrock\dungeons" folder, and they will appear under custom dungeons inside the game.

ok but steam want i pay again...

You do not need to buy a 2nd copy from steam to play custom dungeons You simply need to get them from here instead:

http://grimrock.nexusmods.com//?

Download whatever you want. It has a choice between download manually or download "manager", i have never used the manager, i just download them like i would anything else.(manually) Then place the unzipped dungeon (.dat file) into:

"Your windows profile"\documents\Almost Human\Lengend of Grimrock\dungeons

If you bought Grimrock from a Humble bundle, then you should be able to access your steam key from your Humble Bundle account.
Once you find it, open steam, click games (up at the top), click activate product on Steam. Then paste the key when it prompts for it.