In my opinion Silverfast 6.6 is a much better choice for Howtek scanners than Aurora. Even if you have a full set of disks for Aurora you still need a dongle to make it work, and in the Macintosh world Aurora works only with the old classic (pre OSX) system.
The only significant problem I have found with Silverfast and the MAC is that Version 6.6 only works with OS 10.3 and 10.4, and MAC OSX is not very SCSI compliant so the choice of card is very important. I was using the D4000 with OS 10.4 with an Adaptec 2906 SCSI card but this combination would not see the Howtek 7500, and I also had problems with an Adaptec 2930 card. The most reliable SCSI card I have found for MAC OS X with the 7500 is the Acard AEC-6712WM/TUM.
Sandy
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