[1st] Once you download the zip, you need to unzip it first. Inside there, will be the addon called "workshop_dupe_permissions", just place that in the addons folder.

[2nd] Then, there will be a file called [i]arming.lua[/i], just place that file in this directory, and you need to replace the file that's already in there. 
GARRYSMOD_DIRECTORY/gamemodes/sandbox/entities/weapons/gmod_tool/stools/duplicator/arming.lua

[3rd] Restart your server, and workshop dupes will work for admins as default. You'll be able to change that in the ulx group permissions under [i]Cmds - Apple's Creations[/i]
