same here, using Kde Neon user edition (based on Ubuntu 18.04)
Warning: Failed to install org.freedesktop.Platform.openh264/x86_64/19.08: runtime/org.freedesktop.Platform.openh264/x86_64/19.08 needs a later flatpak version (1.4.2;1.2.5;1.0.9;)
same here, using Kde Neon user edition (based on Ubuntu 18.04)
Warning: Failed to install org.freedesktop .Platform. openh264/ x86_64/ 19.08: runtime/ org.freedesktop .Platform. openh264/ x86_64/ 19.08 needs a later flatpak version (1.4.2; 1.2.5;1. 0.9;)