And used the Architect installer to install Manjaro KDE Plasma full or minimal unstable branch with systemd-boot. But the installation ended always with package download errors. Don’t know if it were always the same packages that failed during my various install attempts. But I have noted the following package messages once:
Kjobwidgets-git → The reported URL returned error: 404
Kdbusaddons-git → The reported URL returned error: 404
Kcrash-git → The reported URL returned error: 404
Kguiaddons-git → The reported URL returned error: 404
Ktextwidgets-git → The reported URL returned error: 404
These error messages lead to the final message that did abort the installation: Error: [install basepkgs]
Tried also different mirror servers with no luck. A single mirror server doesn’t help either. Tried mainly servers in Germany (i.a. Manjaro servers), Netherland and Denmark.
But then I switched to the stable branch and the installation went smooth to the end without any problem.
So I suspect that the Architect KDE unstable branch installation might be broken on both tested ISOs.
KDE Unstable profile is a special case, it might be using kde-git packages which are even more unstable and really meant for testing new features only. Not that they won’t work sometimes, but the KDE devs will make them break whenever they see it fit.