Installing Office Customization

Question

Name: From: file:///D:/Samples/TestUpdatedVersion/bin/Debug/TestUpdatedVersion.vsto

The customization cannot be installed because another version is currently insta

Answer 1

This error should only occur on your development machines.

From Microsoft's Troubleshooting guide for office deployments (http://msdn.microsoft.com/en-us/library/bb608594.aspx):

When you build an Office solution, the built version is automatically registered. If you have previously published and installed the same solution to your development computer, Visual Studio Tools for Office runtime detects that the installation path for the published version and the built version are different after the next build, rebuild, or publish. The error message says "the customization cannot be installed because another version is currently installed and cannot be upgraded from this location." Because rebuilding the solution updates the registry keys, it is necessary to uninstall the first version before publishing, debugging, or running the second version.

To prevent the message from appearing, create another user account on your development computer to test your deployment. Alternatively, you can uninstall the version from the list of installed programs on the computer before you next publish, debug, or rebuild the solution.