I don't know what's wrong with this extension, but I install all other extensions fine, but this one has been giving me an error for a month now: "Installation aborted because the add-on appears to be corrupt."

I'm using Firefox 115.20.0 ESR (32-bit). For testing, I even disabled add-on signature verification, but it still reports that the add-on appears to be corrupt. Installing it from the downloaded XPI file doesn't work either.