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You will first need your license ID and Key.

First, go to your download area.
Once there, you will see two input fields. One for the License ID and one for the License Key.

phpFox 4 User Manual > Downloading the phpFox Script > download id key.png

If having issues and you can't log in:

Make sure you did not copy an extra space before or after the ID or Key. There is no space on either one.
Make sure you are not trying from a mobile device.
Try from a different browser, Firefox seems to work best.