My friend, I am sorry and unfortunately cannot help you with this.
The reason is because I have no idea how to go about this.
Any particular reason why you want to revert back to 1.13? I can assure you that the 1.14 Patches are just finer my friend. I play the game daily on a regular basis, and all works well for me and my friends.
XD
But if you insist on trying this, then I would suggest asking in this area. The proper area where I know folks who are good with this issue can perhaps probably help you.
http://forums.d2jsp.org/forum.php?f=21 Just go to this link my friend, which will take you to the Diablo II forums, make a topic in that area my friend.
XD
I can only assume this would be for PvM purposes? Perhaps you like 1.13 patch of single player better?
This post was edited by JahovahWitness on Jun 19 2016 10:55am