superboringdev [1] filed a deletion request for adwaita-creamy-gtk- theme [2]:
Upstream repository no longer exists and thus the packages are unavailable. No updates since 2019 either. [1] https://aur.archlinux.org/account/superboringdev/ [2] https://aur.archlinux.org/pkgbase/adwaita-creamy-gtk-theme/
