Since there are some unfrequent changes to the gpgnet protocol, old versions would not work with the current FAF lobby server.
Thus you will not find official support for running old versions.

In theory, if you start an older replay, all the files of that replays patch level get installed. But you cannot play online via FAF, but would have to play via LAN or some other solutions. I don't know to which extent this is currently possible.

Players have to have the mod installed in order to write a review

Download the client, install it and login?
It's all described here: https://www.faforever.com/play

So you have shown us that you can't link your account a second time. We still don't know what the error with the FAF Client is.

You have a connection problem. Your request to the API timed out. Maybe firewall issue.

The auto reconnect to chat was a victim of changes made to mitigate the ddos attacks and just has not been recoded yet

If you have too much money, just send it to me.

Yes, they are on a separate network drive at Getzner and everytime it loses connection (which happens a lot), our server cannot remount it for some reason.

The ICE adapter relies on ICE / Coturn servers to make connectivity working.

With the incoming DDoS attacks last year we hastily extended our self hosted Coturn servers with a 3rd party server called Xirsys. Quite expensive and not as successfull "connective" as we were hoping.

Recently Cloudflare has launched their own Calls product as a beta. As part of that we can use their TURN services. Much cheaper than Xirsys, and hopefully more stable and more connective. Today we replaced the turn services from Xirsys with the ones from Cloudflare.

If you have recently disabled the GLOBAL entry in your Client settings for preferred coturn servers, please re-enable it again and give it some time for testing.

In addition to that we will soon bring back the "Force relay" connection in the client that helped some users but had to be removed due to the cost situation with Xirsys.