The 1st version is not (now - stupid forum gremlin) available to try.
http://www.planetootp.com/AUballpark/
MUST USE IE TO INSTALL
Install the program and then when it runs, click on the BROWSE button and locate your BALLPARK folder: (mine is located here)
C:\Documents and Settings\Larry\My Documents\Sports Interactive\OOTP Baseball 2007\data\ballparks
Now just click on a team in the list. All teams from 1901 to 2006 are listed here. In the top window, all of the ballparks for this team will be shown. Click on one and the ballpark will be shown. If you want to use this ballpark, then click on the SAVE AS ... button.
The name is the actual name it is stored on my server as. You can change this as you see fit. I would go with a shorter name, and come up with some kind of naming convention that is easy for you to use. Like the 1st three letters then a D or N designation for day time or night time. Make it easy on yourself, as you have to type this name into the ballpark editor built into the game. You can have a day and a night ballpark.
With my program, most parks are listed with a day and a night park, if it was a park that was played at during the night. If there is no night park, then pressing the night check box has no effect. Note that you MUST select the night check box before you click on a team.