PiB macOS X 64-bit Update in beta

If you're on macOS and want to test if the 64-bit version of PiB works on your system, then please try out the beta version. Here's Valve telling you how to do that:

*"Right-click on the game in the Steam client and select Properties. From the Properties window, click the Betas tab." *

Then select "testmac64bit" from there.