Try searching for the PST file using a third party search tool. http://www.voidtools.com/downloads/
I've had some success in the past using "Everything", when I had some difficulty locating stuff with the native Windows search utility.
I can only say that, typically.... IF the Anniversary Edition was installed "as an upgrade", it should not have deleted any files. At least that has not been my experience, after having performed several.
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.