- One upgrade per customer.
- You must have purchased with your e-mail address. In other words, if you checked the "preserve my privacy" button on Google checkout when you bought the book, you're out of luck, no upgrade for you. This is solely because I can't verify you are who you say you are any other way.
- The price is 50% off. That's $12.50 for digital edition upgrades, and $15 for print edition upgrades. Print edition is subject to shipping and sales taxes. If you bought the print edition and want to upgrade digitally, that's ok. The inverse is not true (no print edition upgrades for those who went digital).
- To upgrade, reply to your original receipt (via paypal/checkout, or from the e-mail that had the attached book). If you've lost your original receipt, send me name, e-mail address, and date of purchase and I'll try to track it down.
There's no checkout page for upgrading. I'll invoice you directly via checkout or paypal. Note: this only applies for upgrades from the second to third edition. No upgrades from 1st to 3rd!