Once your mod is uploaded, a pubID file will be created. This can be found in your mod folder in your Software Inc installation, where you put your mod.

This file is very important to keep if you want to upload updates for example. A common mistake is that you accidentally remove this file when you paste your updated mod into the software inc mod folder. Without this file, the game can't recognize that this is an already uploaded mod and will therefore force you to make a completely new and separate workshop page.

If you have uploaded a mod to the workshop, but can't update it properly, a missing pubID.txt file is the most likely cause. Your mod folder will probably look like this:

Solution is simple and straight-forward. You simply make a new pubID file. First, go to your mod's folder. Then, create a new text-document (.txt file)

Name it: pubID

After this is done, go to the workshop page of your mod. Mark and copy the id of the workshop item. Now simply paste this ID into the pubID.txt file you created.

If you have followed the above steps correctly, you should finally be able to update your mod: