Monterey (and later), and mac ARM
Is kJams currently compatible with Catalina?
No. You can not run kJams under macOS Catalina.
Why not?
kJams is currently a 32bit application, and Catalina does not support 32bit apps.
When will kJams be able to run under Catalina?
The hope is "some time in 2020", the optimistic hope is "mid-2020", but beware "the planning fallacy"
How can I run kJams today if I have Catalina?
You can use the Virtual Machine software Parallels Desktop. Then install macOS Mojave (you can get it from the App store, even under Catalina). There is a forum discussion here. You can make a bootable Mojave Installer USB stick using DiskMaker.
Can I downgrade back to macOS 10.14 Mojave?
If you have a mac purchased PRIOR TO October 2019, then YES, you can downgrade, in two different ways:
- use your time machine backup from before the upgrade
- reinstall from scratch using a USB stick. You can make a bootable Mojave Installer USB stick using DiskMaker.