Can't update iPhoto on 10.8.5

Hi,

Running Mountain Lion (10.8.5) on a pretty old Mac Pro (desktop).

Have iPhoto 9.4.2 installed and getting reminders to update to 9.4.3 (plus "Digital Camera RAW Compatibility Update 5.07").

Thing is that I can't.

The files downloads just fine from AppStore, until about half way.

Then I get error message "An error occurred while downloading the updates.(102"

Can someone help out?