Step 1. Make a backup of your current PWB folder.
Step 2. Make a backup of your current PWB folder (it is important to make a backup).
Step 3. Extract and copy all the files from the PWB v4 Upgrade distribution over the files in your current PWB folder.
Step 4. If upgrading major versions (ex: 3.20.x to 4.00.x), update your INI file with the PWB INI Update utility included with PWB v4.
Please note: The Upgrade distribution files are available on the Downloads page.