It's a disk image (DMG), you need to drag both apps over, XQuartz and CompassClient.
It's really easy! Inside compass, select 'CompassClientPrinter' when printing. A little how-to movie is available here.
This should then generate the .PDF file, download it to your local windows machine, and launch Adobe PDF reader with the selected PDF file. IF this doesn't work for some reason, or you need to look/reprint previously printed files, you can login to the compass web portal and from the menu under your email address select 'My web Print Jobs'. Alternatively follow this direct link : https://www.compass-ed.org/compass/printing/view
If you find yourself thinking your Compass is slow, We have deployed a speedtest tool available here. It tests against our server(s) directly. If you notice jitter or ping greater than 100, then please reach out to us.
If you have any problems, select Help -> Request Help from the menu bar of the compassClient menu. Of course if you have problems with that, you can always send an email to: compass@yumaed.org
The more detail you can give us, the quicker we can solve your problem.