I don't know if everyone had the same problem, but after the update GameGuard always download a new version, then failed to verify the game and PSO2 failed to start.
You could try as often as you want with the same result.
If you had this very problem my solution may work for you as well:
I got it working again after going into the gameguard directory (pso2_bin\GameGuard) looking for all new modified files by sorting by date and removing them (actually I moved them to a sub folder).
Essentially I removed all *.erl files and the GameGuard.ver, all in all 10 files. After that you can start the game as usual and gameguard will download new versions of those file and everything worked after that.
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