I did the live USB KDE thing and Kdenlive package works, appimage does not, fine package then.
I installed KDE 6.6 to disk and had to jump through all the hoops again as described in the 2nd part of this comment All versions of Kdenlive crash on startup - #5 by progonkpa
Noteworthy, my password did not authenticate which I worked around by resetting it as root in live USB env.
Once booted from disk, system time was 1 hour in the future, fixed that.
Then, I ran update and got the arch-keyring error, no permission to write to file or can’t find file, it says.
Now I have commands to work around that too, but last time I did that, I ended up stranded.
I’m running memtest86 atm and will continue with the arch-keyring commands when that finished successfully, like resetthe keyring and do an init of the keyring.
However, when things don’t go smooth from the get-go, it’s often bad news.
If somebody has some inputs on the situation, shoot.