The trouble with svn and versions is that when you use svn info on a FILE it only returns the revision of your file. To get the most recent revision on the server, you need to point it to the svn URL. The snippet can do both.
Just be careful with that because if your repository needs authentication it will not work unless you've saved your credentials in the tortoise svn password manager by ticking the "remember password" box. The --non-interactive switch disables password prompts, which you wouldn't be able to see anyway, because it's hidden away by System Exec.
I guess, as a workaround, you can pop up your own password dialog if you need one.