Win 7 64 bit Ent.
VM machine
First try install avast_12.3.3154, register (it ask me email address) and update program, PC not show up at Device list
Then uninstall, install avast_17.1.3394, register (it did not ask me email), PC still not show up at Device list
How can I know which email address it connected to My Avast account? then I can unregist and re-regist again