Tam said: Unfortunately, Dark Horse doesn't have an app for Kindle.
Here's what their website says:
CAN I DOWNLOAD THESE BOOKS ON MY KINDLE?
Currently, we offer hundreds of graphic novels for Kindle Fire, available for purchase through Amazon, and we are adding more titles every week. Additionally, we have a version of our Android app which you can side-load to your Kindle if you like. Click here to learn how to install the Android app on your Kindle Fire. We hope to offer a version of this app for Kindle Fire which features Amazon's in-app purchasing option in the near future.