Quadrant Next is available on Microsoft Store and Flathub.
If you're on windows, you have to update manually.
Quadrant Next is now available on Windows and Linux.
Warning: Flatpak might have login issues, but that's not confirmed/denied yet. I've yet to check this. If you're actively using Quadrant ID, consider waiting before updating. (Last time I was testing Linux there were no issues, but it's really hit or miss with handling protocols through flatpak, you might want to opt for the Fedora/Debian packages or attempt to use the AppImage).