There is now a working progress bar and you can cancel downloads too. It's not possible to resume downloads at present though.
You must have decky loader already installed, if you don't know how to do this, it's too early for you to try this plugin. The scripts are still rough and contains development testing code, please excuse this for now.
Switch to desktop mode.
Download the installer.
Double click the junk-store-installer.desktop file
This will launch a browser and ask you to log into the epic store. Once logged in copy the authorizationCode into the Konsole window where it's asking you to do so and hit enter. Please note that you might get a bunch or errors here, paste the code and push enter anyways, it should succeed.
It will ask for your sudo password to restart the plugin loader.
Go back to gaming mode.
The usual thing about game compatibility applies. This is still beta software, report any bugs so I can look into them. Things might not be super smooth, but having epic games install and run right from within steam is kinda cool and I wanted to share it.
Those who are curious about where the games lists comes from are encouraged to check out ~/homebrew/data/junk-store/tabs
While it does work on linux, I'm not going to support it at this stage, if you're keen and want to script dive you might be able to figure it out.
I develop on Vanilla Arch and I test the code on a Manjaro Virtual Machine. So you may have some success if you try it on one of those.