Since there seems to be some confusion as to how player made modules work on Steam, and the instructions aren't very clear except on the modules themselves...
Step 1: Find the Module you want to play and click the Subscribe Button.
NOTE: Modules with the same name must ALL be subscribed to or you will get dumped to the main screen with an error when you hit an area transition to go to the next floor. Some module makers create Collections on Steam. In the Collections side it allows you to Subscribe ALL at the bottom of the page. like these.
Step 2: Check for a STEAM download on your downloads. You should see a STEAM download for Solasta.
Step 3a: Start up the game and go to Dungeon Maker on the side. Select the 1st dungeon of the series with the same name and then click the Play button at the bottom.
Step 3b: OR... click on New Adventure... click the Change Campaign button... Select USER CAMPAIGN... Click the CHANGE button....Select the 1st dungeon of that series... and click play... It will then allow you to select the characters of the level the module is set for... make SURE you have characters of that level for that module or you will see a blank screen.
Step 4: Once you complete that series of modules under the same name that you have subscribed to... there will be an exit point at the end telling you this is the end of the module. Exit that module by that exit point and you will get a screen similar to this one...
You then click the Update File button under each character, and it will export them with all the Levels and EXP they gained in that module as well as the items they gained.
You can then use those characters to play other modules that require characters of those levels.