I am currently playing on Minecraft’s version 1.6.4 but’s want to use mods from 1.2.5 on my current version, is there ny way I can use these 1.2.5 mods on my 1.6.4 version?
Short answer: nope.
Long answer: mods of older versions will have to be rewritten for newer versions. Only a very few exceptions exists of older mods working with newer versions (1.7.2 in 1.7.10; 1.9.4 in 1.10.2).
"We live on a placid island of ignorance in the midst of black seas of infinity, and it was not meant that we should voyage far."
Ahh thanks, this world would be a better place if all mods worked on all versions