From MaGog's logs for 18 November:
NOTE! CHANGED Back to the Future: The Game, file_size: 1 MB ***TO*** 2 GB
[GOG fixing a bug introduced some 9 days ago (#4261)]
NOTE! CHANGED Witcher: Enhanced Edition, The, os: Windows (XP, Vista, 7, 8) and Mac OS X (10.6.8 or newer) ***TO*** Windows (XP, Vista, 7, 8) and Mac OS X (10.8.0 or newer)
NOTE! CHANGED Witcher: Enhanced Edition, The, sys_req_mac: OS X 10.6.8 or later, Processor: Intel Core Duo 2GHz+, Memory: 2GB of RAM, Graphics: nVidia GeForce 320M (or better), AMD Radeon HD 6750M (or better) or Intel HD Graphics 3000, Recommended two-button mouse, or Apple mouse with Secondary Button / Secondary Click enabled ***TO*** OS X 10.8, 10.9, 10.10, Processor: Intel Core i5, Memory: 4 GB of RAM, Graphics: nVidia GeForce GT 650m (1440x900), AMD Radeon HD 6750M (1440x900) or Intel HD 5000 (1366x768), Hard Drive: 13.5 GB free space, Recommended system requirements - Mac: OS: OS X 10.8, 10.9, 10.10, Processor: Intel Core i5 or Core i7, Memory: 4 GB RAM, Graphics: nVidia GeForce GT 650m (1440x900), AMD Radeon HD 6970M (1920x1080) or Intel Iris Pro 5200 (1440x900), Hard Drive: 13.5 GB free, Display compatibility notice: 1440x900 resolution is the recommended resolution for best performance. It is not recommended to use native Retina resolutions