New client installs, but does not run.
Recently, RO underwent a three-month long update. It returned live to the public on the 3rd of February, 2020. Players are required to re-download the client ( Ragnarok Online Client Download Link ) in order to play the game with the updates. Although the date listed under the download link is still October 18, 2019, the client file is in fact the new client file meant for download. Unfortunately, the game doesn't yet seem to be playable via CrossOver, and perhaps any other bottling software due to said updates.
After updating CrossOver to v 19.0.1, I managed to install the Ragnarok Online into its own bottle via the usual installation process. I didn't experience any issues during the process. The only difference is just using the new client file as the installer.
You will find an error dialogue box upon clicking "Play" to run the game. Whatever changes made in recent updates to the game are seemingly not supported by CrossOver, and I'd assume any other intermediary software of the sort.