In short, this is Stockfish Experimental. If you guys remember, there was a member on former M.Z forum, who added some extra options to the engine including "Magic Tactic Solver" option.
I updated the engine till yesterday's patch "continuation histories when in check". https://github.com/official-stockfish/Stockfish/commit/bb5589b829b79d7c60a820d4b1634dccbc4bbb3fMany thanks to An.Eg.Go., and Romeo for storing the code since 230319!!
64 bit popcnt engine & source code => https://www.mirrored.to/files/8VH1WJ0K/