Unable to install SP2 Rollout 4

I am trying to install Rollup 4-v2 on Exchange 2010.  I tried this on 2 different servers and I come up with the same error.  I did stop IIS prior to install.

"Setup wizard for Update Rolloot 4-v2 for Exchange Server 2010 Service Pack 2 (KB2756485) ended prematurely."

I do get error 1603 in the eventlog and I have followed this:
http://go.microsoft.com/fwlink/?LinkID=191548 but it has not helped.

Any suggestions?
FundFireAsked:
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FundFireConnect With a Mentor Author Commented:
I was finally able to install Roll up 4.  These are the things that I did:

Followed this link:
http://www.expta.com/2012/08/exchange-2010-sp2-roll-up-4-does-not.html

especially the section that says this:

1- My problem was that I installed PowerShell v3 before Update Rollup 4-v2, so "control cannot leave a finally block" was an issue. Rather than substituting an entirely blank script or commenting out the return statement in C:\Program Files\Microsoft\Exchange\V14\Scripts\ManageScheduledTask.ps1, I changed "return $success" to the logically equivalent "Write-Output $success" in line 462. I also removed the now invalid digital signature. My ExecutionPolicy was already RemoteSigned. With these changes the rollup installed normally. The rollup didn't replace the ManageScheduledTask.ps1 script. I ran the rollup msp from the GUI rather than an elevated command prompt. I was logged on as a builtin Administrator. That didn't seem to be a problem. I did open its properties page and unblock it, however.

2- I downgraded my powershell to V 2.
uninstall WMF 3.0 (which includes PowerShell 3.0, which is not suitable for Exchange 2010) from Control Panel > Programs and Features. No need to uninstall .NET 4 - it runs side-by-side with .NET 3.5 and is not an upgrade.

3- I DID NOT do this, it would not install, I left it as Remotesinged.
PowerShell : Set-ExecutionPolicy -scope LocalMachine - ExecutionPolicy Undefined

After this I was able to install.  

I have to say this was so frustrating because this was a fresh install and I had to go through this to install a roll up.  Microsoft needs to do better testing.
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AmitIT ArchitectCommented:
Did SP2 is already installed?
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FundFireAuthor Commented:
Yes.  The version that I have is 14.2 Build 247.5.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Why dont you try to upgrade to RU5v2 ?
Is the Installer service running on the server ?
Did you try to download a fresh file and install ?

- Rancy
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FundFireAuthor Commented:
I tried RU5v2, the same thing.
Installer service was not running I started it but I got the same error.
Download fresh copy, the same thing.
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AmitIT ArchitectCommented:
can you run sfc /scannow from cmd
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FundFireAuthor Commented:
I ran it and got back:
Windows Resource Protection did not find any integrity violations.
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FundFireAuthor Commented:
I captured the log in case you guys can see something in there.
update5a.log
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FundFireAuthor Commented:
Hi guys,

One question, how do you upgrade exchange sp1 to sp2?
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FundFireAuthor Commented:
I was not able to get a bottom of this through expert exchange and followed other link.  Although I really appreciate all the assistance I received.
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