MarsSeed [1] filed a deletion request for plasma5-theme-catppuccin-git [2]:
Does not work on current Arch Linux, which has KDE6. Upstream has not yet been ported to the latter. If and when it receives the needed updates, a new 'plasma6-' package is to be uploaded to AUR. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/plasma5-theme-catppuccin-git/
