Sign in Hangs on blank screen - El Capitan 10.11.6

I am adding Bitdefender to my older MBP 2010 which is limited to OS El Capitan 10.11.6.

After installing, it wants me to sign into my account. When I click sign in, pop up screen comes up but it is blank and never turns into anything.

I have rebooted, reinstalled, etc and cant break this behavior.

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