How to handle application upgrades from free to paid version on Android
<p>I plan to go with the free version in order to promote the paid version.
Few questions:</p>

<ol>
<li>In your experience,  is it helps?</li>
<li>After a user has installed the free version, if he wants to install the paid version,
he needs to remove the free version first ?</li>
<li>how it effects downloads rates ?</li>
<li>What is the correct way to do it?</li>
</ol>
