How to upgrade "Name Your Own Price" products
To get a new version of a "Name Your Own Price" item you will need to add the new version to the cart and checkout again.
The reason for this is that the "Name Your Own Price" policy asks that you name the price of the upgrade as well. You can of course edit the upgrade price to whatever you feel the upgrade is worth to you including zero if you feel the upgrade should be free.
The VERSION HISTORY tab on the product will let you know what the changes in each version are so you can see how much has changed from version to version.