I'm not going to lie; I cannot really understand what you are saying at all. I notice you are from Asia, so I understand why the comprehension if your post may be troublesome.
Anyways, you can try going here
Blizzard Entertainment: Technical Support Site to find earlier patches (one of the bullets says something about looking for earlier patches; go for that one). If you are downgrading from one version of Diablo 2 to a lower version, make sure you first have the regular files in the main Diablo 2 directory (aka make sure you don't have the modded files in there).
You can also try taking a look at my sticky on how to make subfolders in the Diablo 2 directory to hold your mods (this would be more if you plan on playing many different mods). Good luck.
I'm not going to lie; I am not an experienced modmaker or anything (I am just a modplayer) so anything you do is all on you. I would say check in with the educated people at the Phrozen Keep, but they appear to be down for the time being =(