There is a mob I want in Minecraft, but it comes from a 1.6.4 mod. Is there anyone who can decompile it's files so I can reintegrate it into 1.7.10?
I really think the only person who could help you is the mod author. It's not very fair to steal someones work. The copyright phrases at the end of some mod posts even tell you to not copy their stuff and sell it as your own.
Oh, no no no! I'm not going to sell or give away anything! I just want this for my own personal use!
With a little luck the mod you want to copy from is open source. You can see the code on a website linked to the thread if it is open source