Hello Doug,
I tried that way. I took the TAR link from Discord, I downloaded on the server using wget, I extracted the files, I put them in the appropriate web folder. I checked again the permissions.
Now even the CSS seems to be wrong. And the /install is "not found".
I don't see how differently I can do it. I'm trying it on a different hosting to see if the issue is coming from my server, but I'm running PHP v7.3 on Apache (Ubuntu distro) and I've never had such an issue.
Jonatan