Problems installing org.freedesktop.Sdk.Extension.texlive/x86_64/23.08

When I run the command:

flatpak install flathub org.cvfosammmm.Setzer

It installs also texlive. When it is downloading, it gets to 9% then moves to 7% then 6% then 9% again and then I get :

Warning: While pulling runtime/org.freedesktop.Sdk.Extension.texlive/x86_64/23.08 from remote flathub: Server returned status 404: Not Found

I removed everything and installed it again and I get the same problem. I even uninstalled flatpak but I still get the same problem.

I have Flatpak 1.12.7 .

What can I do?

Let’s start with updating flatpak to something more recent like 1.15.8?