1. Follow the link to your Humble Store download page given by the "Your Risk of Rain Kickstarter Tier 2 order is ready" email. 2. There should be a little message saying "New version posted: 2013-05-13 at 11:05" (The date and time will different for each build released). 3. Click the download button to download the file. Make sure to check the version number to make sure it's the new one. Make sure to extract the files out of the .zip as well! Have fun!