Need Help Setting Up plone.app.workflowmanager Locally

I’m trying to set up plone.app.workflowmanager locally but can't figure out how. There’s no proper documentation, and it’s not compatible with the latest Plone version (6.1). The last compatible version was 5.1.

Additionally, the YouTube video linked in the GitHub repo’s README is no longer available.

Can anyone help me understand how to add it to my development environment?

Upgrade it to work with Plone 6 (Classic UI). Install it and report the error after trying to fix it by yourself.