Well, lookie here! Another thread on this forum had the file attached. I'll attach it here as well, in case anyone runs into this. I deleted my logic preferences file just to be on the safe side, placed the Axiom.bundle in the MIDI Device Plug-ins folder (applications, right click on Logic Pro X, show package contents), started logic, turned on my Axiom 25 2nd gen and boom there it is. Everything works, and I can control devices as intended!
Axiom.bundle.zip