Here are the fictional ballparks:
https://dl.dropboxusercontent.com/u/.../Fictional.zip
1. Download the file. This zipped file contains 50 individual files packed into the one file.
2. Unzip the file. Just try double clicking on it.
3. Find the "Fictional" folder. This folder was created when you unzipped the original file. It contains the 50 individual ballpark files.
4. Copy those 50 ballpark files and paste them into your "ballparks" folder (located in your OOTP17 "data" folder).