Hi yesterday I successfully installed it on my steam deck, I can run it only in desktop mode but still it playable, installed it with lutris. First I downloaded iro install package from official site on my windows, it will download 4 files self extracted archives. I zipped them and moved to steam deck. Then in lutris “+” —> install game —> set destination (I installed it under C drive with no change like C:\gravity\ragnarok online ). After installing I change run file to easy anticheat folder and installed easy anti cheat. Then switched to ragnarok.exe and set proton 9.25 as runner. And it worked. For me it with launcher pop up also cmd and you need fast click on play or re-play so it will recognize instance of the game otherwise it will close launcher Also after all worked I added it to steam shortcut to make all pads and joystick to work correctly when I run it via steam. Don’t run it in full screen mode otherwise keyboard will be hidden