The new version of tibia 8.5 is not longer working on Crossover, unfortunately the game was updated and every time you try to use it it asks you to download those updates, after downloading them it has to reset but it never comes back on. The only solution I see is by installing in windows and then coping the installed/updated folder into Mac but this is not an option for users that does not have a windows computer or partition.
Im sure the game will work when the new updated client(maybe 8.51) comes out, too bad it takes really long for CIP (the company that runs tibia) to update their clients(this has happened several times before and they take like 3/4 weeks to update).