It is a fact that ProRes 4444 is becoming a standard intermediate codec for video production workflows. It was developed by Apple, so many encoding options are only available on OS X (for example you can't render ProRes 4444 in After Effects on Windows without using paid third-party tools).
In order to transcode your file without cost, first you need to render your sequence preferably as a lossless codec (Quicktime Animation in this example).
Then you need to download the FFmpeg Windows Build here. Unzip the downloaded FFmpeg zip file. Open the unzipped folder, go to the bin folder and drag your video inside it; for now, rename your video file to YOUR_FILE_NAME:
Open the ff-prompt:
Copy and paste the following text into the ff-prompt and press enter:
ffmpeg -y -f mov -i YOUR_FILE_NAME.mov -vcodec prores_ks -pix_fmt yuva444p10le -profile:v 4444 -bits_per_mb 8000 -s 1920x1080 YOUR_OUTPUT_FILE_NAME.mov
(more about the ProRes options here: https://www.ffmpeg.org/ffmpeg-codecs.html#ProRes)
You will find your ProRes 4444 file inside the bin folder: