XSilverTH [1] filed an orphan request for lunar-client [2]: the package is really old. the launcher has completely changed and updating it isnt hard. you just need to change the version number to the latest version which as of right now is 3.0.3
[1] https://aur.archlinux.org/account/XSilverTH/ [2] https://aur.archlinux.org/pkgbase/lunar-client/
