Now with Steam Workshop - installing mods is as simple as hitting subscribe. For users who use the GoG version though - you will need to do it manually or for those who prefer not to use Steam Workshop. Mods will come either as a .pak file or will be compressed as a .zip or .rar file. .PAK If the mod you downloaded came as .pak file then the modder has made your life easy. All you need to do is drop the file in your mods folder. View attachment 157104 .ZIP or .RAR If you have a .zip or .rar file though you have a few steps. If it is a .zip file most modern operating systems can open the file without a 3rd party program. If for some reason your operating system can't you will need to download a file archiver tool such as, Windows 7-zip - http://www.7-zip.org/download.html Mac KekaOsx - http://www.kekaosx.com/en/ Once you have extracted the file you need to see if it is a .pak file inside, or is it a folder. If it is a .pak file then simply place the .pak as detailed earlier. Now the next step is reasonably easy with a bit of common sense but also is the step where many users generally make a mistake. All you need to be wary of is where the .metadata file is located. Correct Way to Install. You will notice the .metadata file is in the first folder inside mods. When you launch the game and open the mod manager you should see the mod if done properly. Incorrect way to Install. You will notice in the first folder there is no .metadata file. Instead it is in a folder 2 branches below the mods folder. Because it is 2 folders down - the mod will not load properly. Remove the extra folder ( DO NOT just move the .metadata file ) shown as an example above by moving the 2nd folder directly into the mods directory. So it matches the correct format shown earlier. If you follow the steps correctly you will have no issues installing mods. If you need any further clarifications - I strongly suggest contacting the mod author as some mods may require different methods to install. Contact the mod author through the discussion page in the mod overview page.