If you want to install at the user level or don't have sudo privileges add the --user flag to the following commands.
# add flathub repo just to be sure as it might not be enabled if it is your first time using flatpak
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
flatpak install flathub org.freecad.FreeCAD
If you want to install at the user level or don't have sudo privileges add the --user flag to the following commands.
# flathub-beta repo is not enabled by default
flatpak remote-add --if-not-exists flathub-beta https://flathub.org/beta-repo/flathub-beta.flatpakrepo
flatpak install flathub-beta org.freecad.FreeCAD
You may start the flatpak using the desktop file or using the following command:
flatpak run org.freecad.FreeCAD
The different branches can be installed in parallel. To choose which one to run use the --branch flag:
flatpak run --branch=beta org.freecad.FreeCAD
To run a specific executable (for example FreeCADCmd to run without GUI) from the flatpak use the --command flag:
flatpak run --command=FreeCADCmd org.freecad.FreeCAD