Which AVX version specifically does D2R need?

To my understanding it was just a first gen AVX that was accidently put in during the launch version. The i5-4460 has up to AVX2 support so wouldn’t have any problems that require AVX.

Something else to check though is if your motherboard also supports AVX technology. Even if the CPU has it, if the motherboard can’t enable or support it then it’ll be the same as not having it.