[=“John_Alcatraz, post:93, topic:100191”]
If you get that error with that CPU, it probably means that they have enabled AVX by default now.
If you compile from source you can just disable it I think, so its not a huge issue, you can still use the editor with your CPU, you just have to compile from source and disable AVX. All CPUs newer than yours support AVX, so it doesn’t really make sense any more to keep it disabled by default just for keeping UE4 compatible with such old CPUs.
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Thanks for the info.
…In that case it be more effective that UE4 do a hardware scan on the system that its installed and activate or deactivate automatically AVX and other software possible options optimized for specific hardware! (Y) 
…To the UE4 programmers a BIG “Thanks in advance”!