I can install:

Microsoft Unified Communications Managed API 4.0 i get The hash value is not correct!

have down from microsoft site about one hour ago.

what is  wrong tryed 4-5 times today

I try install Exchange 2013 have done prequest to Exchange too

Hi

To upgrade to Microsoft Unified Communications Managed API (UCMA) 4.0, you must first uninstall any previous versions of UCMA that are installed by using Add/Remove programs.

http://technet.microsoft.com/en-us/library/bb691354(EXCHG.150).aspx

Did you do that?

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Hi

Any update on this thread?

Cheers

TechNet Subscriber Support in forum

If you have any feedback on our support, please contacttnmff@microsoft.com

we are also facing same in where on fresh 2012 server we are unable to install the UCMA and getting same error "the hash value is not correct" there is no previous instance of UCMA as this is fresh installation.

please update if anyone else is facing this issue.

Regards,

Prashant Sawant