It did it again just now, crashed because of update to version.
To reproduce, you might be in a game, update the version, finish the game, then start a new one. It stops at the loading screen. Have to restart the client, upon rejoining the server it tells me that there is an update to the modpack.
Because I have multiple installs the log archive thing doesn't work, so I've just attached the logs without any changes to the client.
At least it is consistent: every update while in game = crash at start of next game.
Cheers,
python.log
xvm.log
_Aslains_Installer_Options.inf
Just to add, I don't have any anti-virus other than the standard windows supplied, and there is nothing else running that might have an effect on anything to do with the network side of things.