The 476 Scenario is a scenario running in moddir that goes from 1476-1819 representing 476-819. Just unzip into your EU2-folder and play through moddir. Nothing should be overwritten.
See bottom of this thread for the latest version. Unless specifically stated otherwise, you will only need the latest upload.
If wanting to help in the creation of this scenario check this thread.
DO NOT POST IN THIS THREAD. READ THE STICKY.