The most recent version of the software can be downloaded directly from the website: http://www.parkbenchsoftware.com/visualpst/
Simple overview of the steps to add/update the license:
The license file is located in the Technology Drive>Application Support>Supported_Applications>Powerschool>VisualPST
Once you have that file:
1) Make sure you have the most recent version of VisualPST from our website
2) If you are at the "Please register" window, click the "Register" button - and skip to step 6
3) Go to the "About VisualPST" menu
4) Click "Edit license info"
5) Click "new" for either all users or current user
6) Click the "select" button next to "license file"
7) Choose the downloaded license
8) Click "Register"