title: iPhone App Store (Paid App) - Promo Codes / Updates
body: <p>I have a few specific questions concerning paid applications in the App Store, along with promo codes and updates. I've done my research, but I either haven't found answers, or have found very outdated "I think this is how it works..." answers.</p>
  
  <ol>
  <li>I issue a promo code for version 1.0.0 of a $0.99 app, so the customer gets it for free. When that customer updates to version 1.0.1, will he have to pay? (Does it matter if he updates before the 4-week expiration date of the promo code?)</li>
  <li>I release an app that's "free for a limited time," at version 1.0.0. For version 1.0.1, I change the price to $0.99. New customers obviously pay the $0.99, but what about the customers who purchased within the "limited time" window? Do they have to pay when upgrading?</li>
  <li>I've heard rumors that the answer to the above question is "Yes, existing customers have to pay when upgrading" only if it is a <strong>major</strong> version change. Eg. The customer got 1.2.0 for free, and will get the 1.3.0 update for free and 1.4.0 update for free, but will have to pay for the 2.0.0 update.</li>
  </ol>
  
  <p>Thanks!</p>