For the asmFish 2017 11 05 there is one option as a base bmi2 and popcnt. What does base mean? Is it just a weaker version of the correct one or is it the fully capable engine https://github.com/lantonov/asmFish/tree/executables/Windows
base version is for everybody, all Windows users. The
other versions are built for specific hardwares, and should outperform the base version if you have the hardware.
popcnt versions, if they crash on you fall back to the base version.