I never use Auto anything - anathema. I downloaded 3.7 (Windows XP) -it was seemless and works fine (but can't vouch for auto anything). All that said, it has been vastly superceded by ACR 4 Beta bundled with PSCS3 Beta. Once you use that, you'll never go back to previous versions of ACR. This has most of the Develop module of Lightroom, along with a Point Curve, (which is very regrettably lacking in Lightroom, meaning in Lightroom we can't make shifts of end-points - one of the most useful adjustments of all). The amount of refined control you have over almost anything you could reasonably expect at the raw conversion level is incredible.