Hi,
I run community builder on about 30 websites and to me it seems, that the updating process from backend doesn't work: I'm logged into Joomlapolis and in a separate tab I go to my sites' backend, click on Community Builder -> Plugin management -> install new plugin -> install from web -> update and all it offers, is the language plugins. CB Autoactions and CB Conditional are not offered, instead it says, I'll have to buy them even though I have a Professional subscription.