Hi, My first post here so please be gentle 
I have an Acer Aspire 5738Z with a T4200 Pentium Dual core CPU running Windows 7 Home Premium. The Get Windows 10 app is telling me that I can't install Windows 10 because the CPU isn't supported. A bit of research suggests that this is because NX is not enabled in the Bios, however, even though the CPU supports NX there is no option to enable it in the latest Pheonix Bios incarnation (v1.34) on the notebook. I've chatted with Acer support but it seems all they can do is follow their script and point me towards the Microsoft website where you can check if Win 10 is going to be compatible with the notebook. This obviously pointless as I get the same result. Does anybody know how I can enable NX on the CPU please or if indeed the problem can be overcome by a different method ? I surely can't be the only one with this problem ? Cheers for any help offered