NOTE: You may have to run the WurmLauncher.exe as administrator. Navigate to your WurmLauncher.exe file, right click it, Properties, Compatibility, check the box for Run this program as an Administrator, Ok.

VIDEO: Freth's video on how to run an alt with Wurm Unlimited

1. Navigate to your Wurm Unlimited folder. If you're unsure where the game folder is you can navigate to it through Steam by right clicking on the library listing, Manage, Browse Local Files.
2. Go to your WurmServerLauncher folder.
3. Copy the file named steam_appid.txt to your WurmLauncher folder.
   

You can now run more than one copy of Wurm, but you must run subsequent copies of the launcher from outside of Steam. A few ways to run the game external from Steam:

1. Make a shortcut of the executable and put it on your desktop, then use it to run another instance of WU.
2. Run the game, right click on the icon in the taskbar, pin to taskbar. Then you can run another instance of the game from the taskbar by right clicking the icon and selecting Wurm Client.

1. Follow the Windows setup steps above taking into account that Linux will have a different path. Again, you can use Steam to find your folder as per step 1 above.
2. Copy the libsteam_api.so found in the WurmLauncher folder to the nativelibs folder (if it doesn't already exist).
3. Run the executable, which is “WurmLauncher” (no extension) outside of Steam.