Secondly, most game mods are cashed which means while you may download mods from the website it will download an older version. I have reported that issue on their public forums, and the administrators are saying that they are working on it. The error seems to appear when the mod file is larger than a few Kilobytes (not sure exsatally how many kilobytes) This is STILL an issue on steamworkshop.download's end, we cant do anything about it. You can also manually unload a mod in the Subscribed Mods menu.Thanks to u/No_Climate7825 investigations it turns out the error 'Free Space Left' doesnt just affects all games but rather it depends on the size of the mod. If the current mod has an error that causes Wrack to crash, you will be asked if you want to unload the mod. Loading mods will also disable certain achievments. To check if it loaded properly, check to see that the time attack, score attack, and gallery mode menus are greyed out and unselectable. After Wrack restarts, the mod should be applied. If you want to load the mod now, click yes to restart Wrack. If the mod wasn't already loaded when you started Wrack, it will ask you if you want to restart to apply the changes. To load a mod, simply click on the one you want to apply it as the current mod. Subscribed Mods are loaded one at a time within Wrack, but more can be manually added (see the next section for more). If a map is out of date (wrong format), it will fail to load and display an error. To load one simply select the map you want, then select your difficulty.

Subscribed Maps include no custom content, so multiple maps can be loaded at a time into Wrack without any issues.

Depending on what you downloaded, the mod you are looking for can be located in either Subscribed Maps or Subscribed Mods. From the main menu, click on New Game, then on Workshop Content. To load mods you have subscribed to, you need to browse to the workshop content menu.

Manual steam workshop download