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.
Quark 126.96.36.199 is the most recent version you can run on that mac.
What I can suggest as a low cost alternative, is you can purchase this imac for 149$.
That imac runs el capitan, mac osx 10.11. So that mac can run even the most current version of quark. However, due to the very low cost of that machine its processor and ram specifications are very light.. Meaning, this mac isnt going to be able to run several programs at time. You could run a new version of quark without issue, just dont plan on running more than quark and maybe a web browser or some non resource intensive programs.
But it is an effective low cost solution that would allow you to use a newer version of quark, without breaking the bank.
If you have any further questions, let me know.
I strive to provide great service, and greatly appreciate a 5 star rating clicked and submitted when you are satisfied. If you do not submit a rating, I am in no way credited for my time. I always answer follow up questions.Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.