Blackmagic disk speed test

Does anyone use Blackmagic disk speed test for their iMac? I downloaded it last week from the app store and can't get it to boot. I know it says it requires a 64 bit processor (which mine has according to the Terminal). I have a 2008 24" iMac running Lion 10.7.5.

Any suggestions?

via ehMac.ca http://ift.tt/2kZTpWv