Whether you want to make sure you're up-to-date or you're submitting a bug report and need to include your version number, you can check which version of Proclaim you're running with a couple simple clicks.
At the top of your Proclaim window, click Help > About Proclaim to see an information screen. Just below About Proclaim in the new window, you'll find your version number.
You can see if there is a more recent version of Proclaim available by clicking Check again directly above the Release notes.