Haven't tried the new version yet, but for installation of clients, you'll be using your domain administrator credentials to push the product out. That could be a completely different password than what your Avast console uses.
Wait, I totally mis-read that question. If the client is asking for a password when a user tries to open avast on their computer, there is a control password. I know where it is on ADNM, but haven't the slightest on ABP er ABC er whatever it is yet.