Where to get files for rooting Kindle Fire HD 8.9

I’m wanting to root and turn my kindle fire HD 8.9 into an android tablet. I found this video here explaining the process, but the link in the description to download the necessary files is dead. Further down in the description there was a link to this website, saying to post if I had any questions. So, I wonder if anybody is able to provide me with the necessary files, or link me to a different way of doing this.

Thanks in advance.