Maybe I get use this with Docx?

Just seeing if I can actually convert big high res Docx files using adobe products and get a better result than Word alone, so try the free one online, I work in huge commercial print files using word, pix charts, nothing to have a 1GB word file.  The one online says can't convert too complex, okay, So I download free trail for Acrobat DC, okay got to pay, but better see if it even works.....it seems most things hyped online never seem to work.  So get downloads and I wangt to pjut a test file to see what resolution it gets me (and no one ever admits to what resolution it comes out), and low and behold I get this screen, that says chole a single file, docx, xlxsm txt, etc....I click scroll down and not a single docx file even is allowed......did I download the wrong product, is this some sort of joke?  What the heck..........if this is some sort of default setting who would buy this product if can't convert docx files?