Installing Citra with Flatpak doesn't work - Key expired

Hello, new person here. I use Ubuntu, and have tried to install Citra with Flatpak following these instructions. The Flatpak installation itself worked, but the last command line:
flatpak install

Gave me this error:
error: Unable to load summary from remote citra-nightly-origin: Signature made mer. 21 oct. 2020 00:41:50 using RSA key ID F8B088B90782CA9B
BAD signature from " <[email protected]>"
Key expired lun. 26 oct. 2020 02:12:42

All I’ve found about this is:
- a reddit post from 15 days ago with the only answer saying to build from source — which looks pretty complicated to me.
- a GitHub issue from 4 days ago with no answer
- another GitHub issue from 15 days ago saying that the problem is being looked into.

I actually found the third one just now — so I’ll change my initial question to: is there anything new on this? I remembered trying to look it up and the internet somewhat telling me that only the devs can fix a key expiring.

System Information

  • Operating System: Ubuntu 20.04.1 LTS
  • CPU: AMD Ryzen 5 3500U
  • GPU: Radeon Vega Mobile Gfx
  • Citra Version (found in title bar): N/A? whichever’s in the flatpak
  • Game: N/A
  • Screenshot of Issue (include the full Citra window including titlebar): N/A

Diagnostic Log
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Yes there is an issue with flatpak builds atm. You can download a standalone build at then extract it somewhere. You should be able to start it from the terminal (make sure you are in the folder where citra-qt is) with ./citra-qt

You might need to download additional dependencies and maybe do chmod +x on citra-qt as well.

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Thanks for the answer!
With the help of someone more knowledgeable in terminal shenanigans than me, I managed to open Citra \o/

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