I current run linux mint 20 on bare metal on my surfacebook2 (LOL). I currently have raw therapee 5.8 installed. I’m looking to install 5.8.9 dev version on my mint 20. I just don’t know where to download nor install…
It’s really simple using an appimage. Just download it, right click and make executable, then double click and it runs. You can choose whether or not to have it show up on your start menu or not. Personally I don’t bother because I update the appimages frequently.