Installation
OmniStep comes as a ZIP archive and is installed as an extension. For earlier Blender versions it can be installed as an add-on.
Which Version to Use
If you're using Blender 3.6 to 4.1, install the 3.6 version. For newer versions, use the 4.2 version. Both function the same; only the packaging differs due to the new Extension System in 4.2.
After installation, you can find the add-on preferences under 'Add-ons':