Here is a blog post written from the perspective of a community contributor or enthusiast sharing this file: Scaling Up: The Story Behind TTR_tooBig.zip

Be warned: this isn't a "drag and drop" patch for the average player. To use these assets, you'll need to:

High-fidelity versions of the original MIDI soundtracks and unused ambient noise files.

Ensure you have enough disk space; it expands significantly once unzipped.