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Problem Summary. When attempting to install the Java for Mac OS X 10.5 Update 4 for Apple, an error message states:
The update for “Java for Mac OS X 10.5 Update 4” can’t be installed.
Then, after clicking “OK” in the error box:
An error occurred during installation.
Then, after clicking “OK” again:
Java for Mac OS X 10.5 Update 4: Error.
Problem solution. The solution is to run the Disk Utility > Repair Disk Permissions. Then the Java update should install fine using Software Update. If that doesn’t work, try manually downloading the Java Update 4 from the Apple Support site. [ Here or Here ]
Further Reading. Below are more online resources.