Continuing the discussion from Old GMT maps:
The requested URL /downloads/GMTLobbies.zip was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request. it says that when i click link
Remove GMTLobbies.zip from the link and then click on GMTTimeCapsule.zip. It will download everything in GMTLobbies.zip and more cool stuff, like Puzzle Impossible and Louie’s Diner (or whatever it was called).
k and how do I open? into source and what is the source engine called? hammer?
No. You extract and copy the file, go to Computer/Local Disk (C:)/Program Files (x86)/Steam/steamapps/common/GarrysMod/garrysmod/maps, and then paste the file there. Start up GMod, click on Start New Game, click GMod Tower, and there should be more maps there.