Reference in the manifest does not match the identity of the downloaded assembly

SOLVED

Click-once does not install presenting error message:
“Reference in the manifest does not match the identity of the downloaded assembly …exe”

This could be if the referenced project is an executable, you may find that if you change the reference from a project reference to the executable file then try this may work.
Alternatively and if possible change the referenced project to  Class Library.

UPDATE 17/02/2012
Today I have extracted a Windows Forms from a main project into a smaller executable and referenced it from the main project.
I did a few things including above and then also it did not work until I had published the smaller project and it gained a certificate. Think the error was a validation error.