It is located together with the other modules.:
the default for Windows is.
C:\Program Files (x86)\e-Sword
The ESV Bible is copyrighted in 2001,2007 and 2011
Unauthorized reproduction of this publication is prohibited. All rights reserved.
If you want to edit a Bible translation then is it better to take a Public Domain Bible or one that the copyright is expired.
Editing of a Bible translation is not a game; you are responsible for the quality and it is mentally very hard to make it perfect and dangerous if the changes are doctrine related.
See Rev 22:18-19