Welcome to Justanswer.com, my name is Dustin.
I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
As far as charges, 5$ would be the initial authorization, combined with the other charge that would be the full cost of written support if written support is successful. Due to the nature of the internet companies like ours have to ensure there are funds that could be paid, should our support attempts turn out to be successful.
if you do not want to continue, you will be entitled to a full refund.
Now, as far as the quark issue, what I can say is I am very familiar with Quark installs on Mac OSX based systems, including Sierra. The install error has nothing to do with your non profit status. If it was a non profit license issue, then quark would start and give you a specific error about Quark not being registered / activated properly. It would not just crash. With that being said,
If you would prefer, this is something I could fix for you directly, via a screen sharing session on your mac. Would you like to try that?
Senior Technician and Network Switching Systems Operator / Maintainer.