No, I did not. Maybe this update 10.6.3 contains a Rosetta update as well?
I first installed 10.6 from the CD, then I installed Rosetta also from the CD. I needed Rosetta for some older programs. So far everything works but the Software update. Today, I installed an AirPort update and it worked but not the others.
HERE IS PART OF THE DIAGNOSTIC MESSAGE: one is the "AirPort Update"[success] and the other "Mac OS X Update Combined, 10.6.3" [failure]
4/1/10 1:06:12 PM Software Update[2841] SWU: scan found 3 products:
061-7551
061-7594
zzz061-8025
com.apple.message.uuid: BC84B25D-BAEF-4F7F-AF34-44B98FDFFC47
com.apple.message.domain: com.apple.SoftwareUpdate.time.scan
com.apple.message.signature: SUCCESS:
http://swscan.apple.com/
com.apple.message.result: success
com.apple.message.value: 118.88968
com.apple.message.value2: 85.558
com.apple.message.signature2: Software Update
com.apple.message.signature3: SUScanResultCode, 0
4/1/10 1:07:00 PM Software Update[2841] SWU: downloading "Mac OS X Update Combined, 10.6.3"
com.apple.message.uuid: BC84B25D-BAEF-4F7F-AF34-44B98FDFFC47
com.apple.message.domain: com.apple.SoftwareUpdate.time.download
com.apple.message.signature: FAILURE: zzz061-8025
com.apple.message.result: failure
com.apple.message.value: 2.51444
com.apple.message.value2: 0
com.apple.message.value3: 825570510
com.apple.message.signature2: Software Update
com.apple.message.signature3: PKInstallErrorDomain, 102