If you still play stock/vanilla/original, then you may try and download either PE4 or RE, which you can get here:
http://www.silenthuntermods.com/foru...php?board=34.0
They were both made for SH4 v.1.5 (the addon) and I don't really know how they work for v.1.4.
Some of the supermods have included an env.mod allready and adjusted to taste, so in that case just go along with that.