Run the WildWestRO_20230527.exe file and extract to "C:\". If you're only updating, you can skip step 3-4.
Open file browser, navigate to "C:\Gravity\Ragnarok", and copy the "Ragnarok Online" shortcut file to your desktop. You only need to do this step once as the shortcut never changes.
Open the app inside there called "OpenSetup" to setup the game resolution. Set what you want.
Update - Run the WildWestRO_20230611_Patch.exe file and extract to "C:\" and overwrite all files.