Install Python.
Open CMD and execute these commands, let the installation finish:

crypto
 Run python3 -m pip install pycrypto

asn1
pip install future
pip install asn1
(Download the Repository and decompress it in a folder. Open CMD in that folder or move to that path if you have CMD open. Execute this command)
python setup.py install

Go back to the folder where the CertNXtractionPack script is located and place the necessary keys in step1.py, Place PRODINFO.bin next to the other scripts. In a CMD window scroll to the folder and execute in this order:

step1.py
step2.py
step3.py

Ready, you already have your certificate. Save it and use it at your own risk.

Credits:
Everyone who worked on the script. :v