OS X Mountain Lion won’t update

I am running version OS X 10.8.2. In the App Store it shows an update for OS X 10.8.3. I tried to update, but it’s showing the following error: An error occurred while downloading the updates. (102).

Any help regarding this issue will be appreciated...

Solution 1:

This happened to me last night. Close the App Store and Re-Open. Hit Update again next to the 10.8.3 description and it should start up again. This happens when your download connection drops out. The App Store application is actually just a web browsing frame which caches cookies with a delay for queries so it sometimes takes a minute to "refresh" itself to try again.

Solution 2:

You can update manually using the 10.8.3 delta update from Apple.