nostr:npub1kvpk3wzc56u3u26z2nyewghzy9nws23j5z246kd6u8v6daez7jeqhpf9wh is it hiding in the Applications folder on your HD? I downloaded it for a reinstall a few weeks ago. I moved it to a bootable USB drive and stored it away after the install. I did the same for Mojave. Look around. Someone probably has a ditect link to the OS on an install server. Thats how I found both OS.