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Hmm, sounds like Fedora has different

Provides:

for that package; it has

libX11.so.6()(64bit)

, so it's equivalent… (It looks like RD was built for OpenSUSE Leap 15.3, going by the version number.) I'll ask around a bit…

sounds like solution 2 could work then 🙂 because I definitely have x11 installed.

Installed Packages
Name         : libX11
Version      : 1.8.4
Release      : 1.fc38
Architecture : x86_64
Size         : 1.3 M
Source       : libX11-1.8.4-1.fc38.src.rpm
Repository   : @System
From repo    : fedora
Summary      : Core X11 protocol client library
URL          : <http://www.x.org>
License      : MIT
Description  : Core X11 protocol client library.

Ah, yeah, RH &c would work better with the AppImage, per documentation.