The Upgrade Pack is useful only for the owners of the first edition of Exodus: Proxima Centauri. To get it simply select your desired pledge level and then increase your pledge with $35. If you have already pledged (and thank you for that) you can modify your pledge in the same way through the pledge manager. In the post campaign survey you will be able to specify that you pledged for an add-on.
Kickstarter is allowing creators to add specific shipping charges for each country under each separate pledge level. To see what are the charges to any specific country, select a pledge level and go through the scroll down list, every country in the world is listed there.
To add any of the add ons to your current pledge just add either 4$ or 35$ to the pledge. After the project ends we will ask you (using the final survey) for all the details needed to send you exactly what you pledged for.
Don't see the answer to your question? Ask the project creator directly.