This project is deprecated and no longer actively maintained as of 1st July 2019.
Deprecation of the Development Tool
After almost three years, we finally came to this end. As of today, 1st July 2019, this project is deprecated and no longer actively maintained. Why? Simply because I do not own a Windows RT device anymore. I basically replaced it with a Surface Pro (2017) and I am very very happy with it.
Before I close this project for good, I will leave some things behind for the future developers. Firstly, the last version of the Development Tool, which can be found here (and of course the GitHub page about the tool). Secondly, everything I still had on my machine with regard to Windows RT. For Windows RT 8.0, go here and for Windows RT 8.1, go here. The passwords for both folders is XDA.
If there is anything, feel free to contact me.
P.S. I really want to thank @Qiangong2 for all his help. Without him, this project would not have existed.