Is it possible to get an adv dupe I download from garrysmod.org on to a build server i play, I can currently only use it in single player
If it is not on the server, than no, but most servers have Adv.Dupe.
1: The server has to have Adv Duplicator as well.
2: Delete your Adv Duplicator. Gmod.org versions are old and outdated. To get the latest version, you need to use SVN. Here’s an SVN tutorial: http://www.facepunch.com/showthread.php?t=688324
or you ca get the latest version in the Wire SVN
That’s what I said.