As far as I can tell there have been no updates since the official release. There are drivers with a newer build date at their web site but when I compared the 32 bit XP drivers they were byte-for-byte identical to the first release. Maybe the 64 bit drivers were updated?
A few people earlier in the "screenshot" thread were able to do so:
They had to retain the AAC drivers from the Hauppauge version though.
By the way, on my Intel Q6600 CPU and ATI 8600 GT GPU I get only about 1 percent CPU usage while watching with Arcsoft's player. You should be able to get small single digit percentages too once you get DXVA working.