meh  ~  flatpak install --user https://flathub.org/repo/appstream/org.pitivi.Pitivi.flatpakref
Installing: org.pitivi.Pitivi/x86_64/stable
Required runtime for org.pitivi.Pitivi/x86_64/stable (org.gnome.Platform/x86_64/3.24) is not installed, searching...
The required runtime org.gnome.Platform/x86_64/3.24 was not found in a configured remote.
error: The Application org.pitivi.Pitivi/x86_64/stable requires the runtime org.gnome.Platform/x86_64/3.24 which is not installed
 meh  ~ 