same problem here. yesterday there was a small chance it would eventually start the riot game client after atempting to reconnect a hundred times for 3 minutes straight, but most games just ended and remade, but today it has been impossible to start a game. Now it doesnt seem to connect at all anymore. firewall is not the problem at the very least. Repairtool did nothing, full repair only did its small bar for a minute and did nothing. A full removal and complete reinstallation did nothing.
On i think the first game attempt after the update the client crashed in the loading screen (happens sometimes due to my pcs ram hitting its limits, so not neccesarily connected), but it took my entire system with it which never once happened before in at least a year of it being runing and functioning like that. I had to cut the power to kill it.
I've also come across a couple people in the few games I got to start yesterday that have/had the same issue or know people that have.
After champ select it just drops straight to the reconnect default client window. the Riot client process starts up, but nothing happens with it ever and it just goes stright back to the reconnect screen after a second
The game is currently de facto unplayable for me