I had to replace my phone because of an upgrade malfunction issue.
I was given a new phone, now I cannot download my phone security.
Go into your Central account and delete your previous phone from My Devices, then follow the instructions from this article to install Bitdefender on your new phone.
Otherwise, you can contact support from here, Activate and Install. Chat is usually the fastest way to get things started. Phone support is not toll free.
All Bitdefender Home Product User Guides:https://www.bitdefender.com/consumer/support/user-guides/