There was an issue with users getting a Steam API error when trying to use the SR4 Upload Content Tool. This issue was a holdover from the the modding beta where users would need to request a key from Minimaul to have access to it. Restrictions have been removed so that it will now work for everyone, and the tool has been uploaded Steam directly. You can find it in the Tools section of your library with the name "Saints Row IV - Workshop Upload Tool." You can also continue to use the direct download version from the tutorial thread as well. EDIT: There may still be an issue with the direct download version. We're doing some testing.