Have had the problem on windows. The necessary config files will be generated when you start the program the first time. If this is not possible, like in your case, it can be because your setup doesn't meet the minimum mygiftcardsite requirements. If your sure your system is above these requirements, try if you can update some drivers. I know, that Mac OS handles these itself. But right now it's the best advice I can give you right now. And for me it was a driver for my GPU.
Thanks for the information, I will try to figure it out for more. Looking for the same issue.