Okay so, relaying some stuff here so bear with me!
First of all, sorry to hear that the version seems to be outdated. If this really is a compatibility issue and you cannot find a workaround on your own, then you're unfortunately going to have to wait just a bit. Frictional are currently on holiday and as such, aren't doing any actual work and support officially at the moment.
Regardless, I have now assigned this thread directly to our Community Manager, and they will get in touch with the Frictional Developers and/or Mac persons and try to get a proper fix for this pushed out ASAP. You aren't the first person to note that there may need to be a version update for Mac, and we're sorry for the delays.
If you are still able to play the game, then by all means, you are welcome to continue! If you experience difficulties however, we may or may not be able to provide proper support based on the errors or issues. As moderators (Mudbill and myself), we don't have access to the source code of Amnesia specifically, but we may be able to assist with some issues depending on their nature.
As I mentioned, I have assigned this thread to our Community Manager, however you are welcome to send Frictional Games an email directly through their
Contact Page if you wish.