I see a lot of people on Steam complaining that it won't run without AVX support... what exactly did you use AVX for?
The search space for the plans is ridiculously large, so testing pre-conditions needs to be insanely fast. With AVX, you get to test up to 256 boolean preconditions in one go!
To give you an idea about search space: the Orcs have a repertoire of 115 possible actions. Stringing together a plan of let's say 12 actions (some plans are longer), gives 115 12 possible plans. That is a scary big number: 5350250105473711181640625
A* helps guiding the search through this space, but can only do so much. So every A* operation needs to be as fast as possible.