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License discount for previous owners

If you own a previous version of the book or a hard copy (e.g., purchased from Amazon), you can get a 50% off discount. Click the button below to pay:


As this is not an automated process, it may take 24-48 hours to process before you will get the download link.

If you have a hard copy, please email your proof of purchase (e.g., Amazon email receipt) to kent@ttdev.com.