I have also been through several OS X updates, including the latest mentioned by @ntrim without difficulty. I suspect you accidentally dropped the updated application icon into the wrong folder. If you dropped it into Applications as you are supposed to, you would have been told another copy already existed and been given the chance to keep both or replace. Did that happen? If not, you definitely put it somewhere else. Search your drive for it and drag it over to Applications.
In the worst case, you might have to re-download the application. But updates do not touch your data. Once you have a functioning copy of Manager in your applications folder, look under About Manager to see the location of your data and import your file from there.