we have analyzed our crash log and noticed that many crashes of QuarkXPress 2018 happen on Yosemite.
Though we are not preventing it to be installed on Yosemite, QuarkXPress 2018 is NOT supported on Yosemite (MacOS 10.10):
As we cannot fix these issues on Yosemite, Apple has made too many changes in the last three versions of MacOS, we will start to prohibit QuarkXPress 2018 to be installed or used on Yosemite with the next update to QX2018, which will be released beginning of August.
Also Apple is not supporting Yosemite either anymore, therefore you should upgrade your version of MacOS anyhow.
- If you want to use QuarkXPress 2018 (without crashes), then please use Apple's last three versions of MacOS:
El Capitan, Sierra or High Sierra.
- If you want to use MacOS Yosemite, then please use QuarkXPress 2015, 2016 or 2017.