The issue is well-known, but I never got around to share it myself and just recently saw it once again at a customer, who experienced the problem.
This blog post will cover how to install and the Exchange Rollup Update successfully without getting the “Ended prematurely” error.
The installer fails with the information:
Setup Wizard for Update Rollup 15 for Exchange Server 2010 Service Pack 3 (KB3184728) ended prematurely because of an error. Your system has not been modified. To install this program at a later time, please run the installation again.
The reason for the error and why the Update Rollup installer is “ended prematurely” is because the server has User Access Control (UAC) activated on the server. For good reason, it is not recommended to disable the UAC.
How to Install the Update Rollup
The recommended process for installing Update Rollups on the server, is using an elevated command prompt (Open a CMD with Run As Administrator) and make sure the Update Rollup is located on a local drive of the server and start the installer using:
SYNTAX example: msiexec /update <UPDATE .MSP FILE>
How to Start Setup Wizard:
msiexec /update Exchange2010-KB3184728-x64-en.msp
How to install the Update Rollup unattended (silent) add the following parameter (/quiet):
msiexec /update Exchange2010-KB3184728-x64-en.msp /quiet
Talking Exchange 