Exchange 2010 SP3 RU16 update fails with error code 2771


Exchange 2010 SP3 RU16 update fails with following error.

Log Name: Application
Source: MsiInstaller
Date: *******
Event ID: 10005
Task Category: None
Level: Error
Keywords: Classic
User: *******
Computer: *******
Description:
Product: Microsoft Exchange Server -- The installer encountered an unexpected error while installing this package. This may indicate a problem with this package. The error code is 2771. The arguments are: AdminTools, 

You can use "Exchange2010-KB3184730-x64-en.msp /lxv <Path for logs>" to generate the Log files and you get following errors.

Couldn't find local patch 'C:\Windows\Installer\9001dd74.msp'. Looking for it at its source.
Resolving Patch source.
User policy value 'SearchOrder' is 'nmu'
SOURCEMGMT: Media enabled only if package is safe.
SOURCEMGMT: Looking for sourcelist for product {6663F722-25A2-490B-9B3E-3B1638C33987}
SOURCEMGMT: Adding {6663F722-25A2-490B-9B3E-3B1638C33987}; to potential sourcelist list (pcode;disk;relpath).
SOURCEMGMT: Now checking product {6663F722-25A2-490B-9B3E-3B1638C33987}
SOURCEMGMT: Media is enabled for product.
SOURCEMGMT: Attempting to use LastUsedSource from source list.

Cause:- Set up was failing while looking for old RUs installer/Cache files.

Resolution:-
Download the required RUs at required path as per the Logs. Example: download the RU14 setup file at C:\RU14
Start the upgrade and it should work if no other issues.

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