Navigate to the AssetLib in Godot (4.4 or higher)
Search for diisis and install it
You will get a bunch of errors. This is fine and expected.
Install errors are fine!
Compilation errors are fine!
Enable the plugin
Reload the project
DIISIS relies on several autoloads that it will add automatically upon getting loaded into the editor. Make sure to reload the project first before following other guides on this wiki or elsewhere.