Is there a new retargetting system for the animation in 5.5?

Hello guys , i was working on my unity project with version 5.4 and i had an exam so i had to quit for some time , after I got back i find there is new version for unity 5.5 so I upgraded my project to 5.5 , and what i found that 5.5 is totally destroyed my scripts, o script is working well so i had to rewrite my scripts, and that is ok.no problem but here is my problem : The only thing that made me hate ue4 is the retargetting system for the animations, now when i play my animations in unity there are lots of deformed arms legs .....i use characters from makehuman and mixamo fuse My question : does we need to retarget the squeleton like ue4 or I'm missing something? Thank you