MarsSeed [1] filed a deletion request for plasma5-applets-nx- notifications [2]:
Broken KDE5-only widget. Upstream discontinued; GitHub repo archived. [a] [a]: https://github.com/nx-desktop/nx-notifications-applet [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/plasma5-applets-nx-notifications/
