Can't download config file to SD card on MacBook Air

[AMG GTS guy]

Hi there! I'm new to the Devialet world but super excited to start listening.  I purchased a used 220 Pro and found the Devialet.com config easy to use.  My KEF LS50 speakers are on the SAM list as well. So, I made the appropriate changes to my config file and WHAM!  Apple's MacBook Air will not save the config file to my SD card. 

Does anyone have experience saving the config to an SD card on MacBook Air?  Any advice would be greatly appreciated.

Thanks!

Brian