Use Bitdefender 2017 Key with Bitdefender 2015

Hello Guys,

i have a Question now i have Bitdefender MultiDevice 2017 Key that i have activated in Central.

But i would like to install Bitdefender 2015 but the Key from 2017 don't work ?


How i Can use the key for Bitdefender 2015 the reason that i would like to use 2015 is that BD 2015 is smarter than 2017.


I have 10 Devices in my Package my Friend use 2017 and i would like to use 2015.


I Hope everyone can help me.


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