Help with creating an integration for smart vents

I have Ecovent smart vents and they have worked well for me over the past 5 years. Unfortunately, support for the product has been discontinued and the app is no longer available in app stores leaving me with no way to control my system if I ever lose the current install of the app I have. It would be great if I could figure out how to control it through HA, but I am not very knowledgeable about programming. Lordsiris had written some working code for this years ago, but I can’t get HA to add the repository. I get the error that GitHub - arraylabs/python-ecovent is not a valid add-on repository. My guess is that something is missing or something in the code is outdated. I have tried reaching out to lordsiris but he never responded. Could anyone take a look at this and help me out? I would really appreciate it!