I'm sorry to report that I'm still getting this error. I have installed the latest version available (I even uninstalled the "patched" version completely and then downloaded the entire game all over again and I still get the error in the screenshot above).
Worth noting is that this usually happens when I try to start the game and NOTHING happens. The busy cursor flashes for a split second, then nothing. No error, and certainly no beta to play! Heh...
I get frustrated and click the shortcut a bunch of times, then sometimes the game starts and sometimes I get that error.
And, lest you think I'm some idiot that doesn't know how to double-click a shortcut, I've tried double-clicking, I've tried running it from the START menu, I've tried highlighting the game in the Impulse windown then clicking "run" in the lower right corner. Nada.
