Problem installing Unified Messaging on Exchange 2010 SP1

[r3voLoL]

Hello, we have an Exchange 2010 SP1 install that is working currently but we want to install Unified Messaging. When trying to install UM, we receive the 1603 error:
Summary: 3 item(s). 1 succeeded, 1 failed.
Elapsed time: 00:00:04
Preparing Setup
Completed

Elapsed Time: 00:00:01
Unified Messaging Role
Failed

Error:
The following error was generated when " $error.Clear();
install-MsiPackage -PackagePath $RolePackagePath -LogFile $RoleLogFilePath -UpdatesDir $RoleUpdatesDir -PropertyValues (" INSTALLDIR=`" " + $RoleInstallPath + " `" ESE=1" );
" was run: " Installing product C:\Exchange_2010\en\UMLanguagePack.en-US.msi failed. Fatal error during installation. Error code is 1603. Last error reported by the MSI package is 'Could not find any previously installed compliant products on the machine for installing this product.'." .

Installing product C:\Exchange_2010\en\UMLanguagePack.en-US.msi failed. Fatal error during installation. Error code is 1603. Last error reported by the MSI package is 'Could not find any previously installed compliant products on the machine for installing this product.'.

Fatal error during installation
Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=14.1.218.11&e=ms.exch.err.Ex88D115&l=0&cl=cp

Elapsed Time: 00:00:03
Finalizing Setup
Cancelled

Any help will be greatly appreciated.

 

[Gulab Mallah]

If you noticed its failing on UMLanguagePack.en-US.msi. How you are installing LanguagePack, choosing from DVD or download?
Check the control panel, you will have to remove the UM Role Exchange from Programs and Feature and try to install it again.
Make sure that this time you selec DVD not download

-Gulab

 

[James-Luo]

How"s the issue currently?

Please check the traces in the Add-UMLanguagePack.en-US and install-LanguageFiles.en file on the “ExchangeSetupLog” folder

James Luo

 

[Edwin Montoya]

Please check the version of the UMLanguagePack.

Download SP1 UM Language Pack from:

http://www.microsoft.com/downloads/en/details.aspx?displayfamilyid=ee7d3f0e-81bd-46ce-8f23-a38199e2c6ee