HP ALM Excel Add-in throws error I have installed HP ALM Excel Add-in. And when i try to launch the excel i see below error message Name: From: file:///C:/Program Files/Hewlett-Packard/Addins/HP.ALM.ExcelAddIn.vsto ************** Exception Text ************** System.Deployment.Application.InvalidDeploymentException: Exception reading manifest from file:///C:/Program%20Files/Hewlett-Packard/Addins/HP.ALM.ExcelAddIn.vsto: the manifest may not be valid or the file could not be opened.

--->System.Deployment.Application.InvalidDeploymentException: Manifest XML signature is not valid. --->System.Security.Cryptography.CryptographicException: SignatureDescription could not be created for the signature algorithm supplied. It seems you are using ALM 12.01 but using the Excel add-in version of ALM 12.53 which doesn't go along. The excel add-in components changes with each version of ALM and that could be a possible reason why you were seeing the error code as below while you are trying to connect to ALM 12.01 using an excel add-in of version 12.53 System.Deployment.Application.InvalidDeploymentExc eption: Exception reading manifest from file:///C:/Program%20Files/Hewlett-Packard/Addins/ HP.ALM.ExcelAddIn.vsto: the manifest may not be valid or the file could not be opened.

--->System.Deployment.Application.InvalidDeploymentExc eption: Manifest XML signature is not valid. Try uninstalling the 12.53 and install the version compatible with ALM 12.01 and see if it helps. Driver For Hp 1320. Could you have a try on below? (quote from the readme) Known Problems, Limitations, and Workarounds • Accessing the Microsoft Excel Add-in: If the user checks the Require Application Add-ins to be signed by Trusted Publisher option in MS Excel->Options->Trust Center->Trust Center Settings.->Hp Deskjet F2480 Driver For Windows 7 64 Bit. Add-ins, the user cannot access the Microsoft Excel Add-in. The Add-in must be signed with a certificate and this must be added to the Trusted Publishers list. Add the Hewlett Packard certificate in the Trusted Publishers list before running Microsoft Excel after installing the Microsoft Excel Add-in: • Launch the HPCodeSigning.cer file found in the Microsoft Excel Add-in installation folder. • Select Place all certificates in the following store during the installation.