SerializationException error

I have worked with Manager for some time. I then tried the Cloud trail version and I liked it. The problem I am having now is that I can’t open the Desktop version. I get the following error. What to do now?

You are probably using some very old version of Manager on your desktop.

Upgrade to the latest version from

Thank you Lubos. Strange enough, I downloaded he same version last week and it did not work. This time around it did work. Thanks again.