ISSUE: Private Messaging won't update
Please navigate to Dashboard > Updates admin page, click on the "Check Again" button, then select the wpForo Private message add-on from the plugins list that has new versions available and click “Update Plugins” button.
Please provide us your order id and make sure:
1. you don't rename the folder, it must be wpforo-private-messages
2. you have not double /wpforo-private-messages/wpforo-private-messages /directories nested inside each other ( /wp-content/plugins/wpforo-private-messages /).