Tuesday, March 22, 2011

MS hotfix for Exchange 2010 fails to install

Error: "An error occurred during the installation of assembly....The signature or catalog could not be verfied or is not valid"

I have received the above error on at least 2 occassions when installing hotifxes from MS.  This can be frustrating, especially if you don't have access to the engineer or did not receive the hotfix directly from MS.  The fix below has worked both times for me.

1) Download and install .Net 2.0 SDK for x64

http://www.microsoft.com/downloads/en/details.aspx?FamilyId=1AEF6FCE-6E06-4B66-AFE4-9AAD3C835D3D&displaylang=en

2) Run the commands below:

cd "C:\Program Files\Microsoft.NET\SDK\v2.0 64bit\Bin"
SN.EXE -Vr *
SN.EXE -Vl


3) Reboot and try the install again.

Grade: Ugh!

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