I can't update to the latest version of iTunes, iPhoto & iMovie

that sounds odd. At least the downlaoded dmg files should work.

So I suggest to do a general fix-up of your Mac OS X :

Use Disk Utility from the /Application/Utilities folder, select your hard drives OSX partition and run a full permission repair.

Reboot after , launch the  -> Software Update and see if this now works.

If not : google for "Onyx" , a freeware system tool ( not supported by Apple of course ) which does excessive analysis and lets you empty all old caches, rebuilds launch services and more. But be careful with this tool, make sure to read the manual.

If even that's not working or if you do not feel comfortable with this, OS X might need to be reinstalled completely. You might also consider having the machine checked at a Apple Store .

Message was edited by: Sjazbec

iTunes updates should be automatic, and are free. For iPhoto, it is purchased software, you must have a copy of the latest version 9.x

What are the version numbers of the applicable software?

If you have the latest versions, why would they show the need for software updates?

iphoto 9.2.x to 9.3 and such is legitimate,free and your right to want to have them up to date .. ;-)

Correctly as given above by others you are to update them manually by either software update or web download if you own ilife11 as a DVD or if this came on restore disk with the Mac.

Apple itself sells these apps ( except iweb and iDVD ) also as individual apps on the AppStore. These are not updateable in the old fashioned terms : instead you just download always the complete app which is always the latest version.

Two things before giving up :

Check your installer certificates , look into the keychain utility, run a first aid and remove all invalid keys/certificates ( indicated by a visible red X and a notice ) from System and User Store.

- If the system installer will still not open the packages within the mounted dmgs , you can bypass it with the shareware "pacifist", an alternate installer tool.

Once again, iTunes is a free upgrade, current version (10.6.3) is also available as a download. If you have iPhoto version 8.x or earlier, you'll need to upgrade to version 9.x ($) before you'll see any available updates.

Lanny wrote:

Once again, iTunes is a free upgrade, current version (10.6.3) is also available as a download. If you have iPhoto version 8.x or earlier, you'll need to upgrade to version 9.x ($) before you'll see any available updates.

Nowhere did the OP write he has v8.x. he said he has currently iPhoto 9.2.3 and Imovie 9.0.4 - so either he has the full ilife11 suite which makes him updateable at no costs to current revisions or he has the apps from appstore wich makes him good to go for re-downloads of the now updated apps.

Okay, didn't see his previous update. He should be able to do updates.

In your User/Library folder, try deleting: com.apple.SoftwareUpdate.plist

😉