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This is an update to my previous post. Was able to successfully activate my Windows 10 64-bit installation of Bitdefender Internet Security 2015. My activation problem may have been caused by a problem in the internet connection of my PC. I had to select Register Now after Bitdefender reported that my key was invalid, and…
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I have the same problem, the only thing is that I am running Windows 10 64-bit. Please see attached screenshots. The Bitdefender I bought is sealed, so I don't think that the key has been used before. I already contacted my local seller and I'm waiting for their reply.