Manual project setup
You can always manually create ScreenPlay content. ScreenPlay searches in every subfolder of you installed path for a project.json file. ScreenPlay should automatically detect changes in this path. If it's not working, you can always press F5 inside the Installed tab or restart ScreenPlay.
Example ScreenPlay Installed base path (672870 is the Steam App ID of ScreenPlay):
C:\Program Files (x86)\Steam\steamapps\workshop\content\672870\
ScreenPlay Installed project inside the 2133699532 folder:
C:\Program Files (x86)\Steam\steamapps\workshop\content\672870\2133699532\project.json
Typical content of a Wallpaper:
A valid project contains a project.json inside a subfolder of your base path. The content of the project folder may vary, because Wallpaper and Widgets can have different types like videos, html website or QML