Installing on Linux
Simply head to https://itch.io/app and grab the Linux installer.
Installing
Run chmod +x itch-setup && ./itch-setup (or use your file manager
to set the executable bit and double-click it).
You'll need GTK3 installed (libgtk-3-0 package on most Debians).
The latest version of itch downloads and installs to ~/.itch. After
a successful installation, itch starts up.
Updating
When a new version of the app becomes available, "A new version is available" shows up in the top right corner.
Clicking it allows you to restart into the new version.
Uninstalling
Run ~/.itch/itch-setup --uninstall to uninstall itch from your system.
Note that this won't remove your library, which resides at
$HOME/.config/itch,
along with any additional install locations you have added from the app.If you really want to uninstall everything, you'll have to take care of that folder as well.