Hi,
Here's the description of the error code 1612:
The installation source for this product is not available. Verify that the source exists and that you can access it.
Normally, it should prompt for the source media (either DVD or a network location where ACE 2009 was installed from) before it will give this error.
Can you provide the source media when you are prompted to or make sure the source media is present before you are applying the patch?
Regards,
Min Keng
Software Engineer
Autodesk, Inc.