By: Pro Evolution Pros
Create a folder called "Original_Backup". Copy your existing dt20_eng.cpk (commentary) and dt05_e.img (menu text) into it. If you mess up, you can restore these.
Navigate to your PES 2016 install directory: C:\Program Files (x86)\Pro Evolution Soccer 2016\Data
Copy the new English pack files into the Data folder. Overwrite when prompted.