You have all the components. Try to download a fresh ntcompress/texconv and a new ASH(that's updated.)
So I did this, saved it in my documents again, and then tried to run Ash again using a regular pac. Not only did it still refuse to detect ntcompress, it wiped out a whole row of files and folder on my desktop(despite being in My documents in its own folder). I just lost the whole brawl soundtrack, as well as some other things.
FFFFFFFFFFFFFFFF-