model constraints

I have downloaded a few impressive models, but they are unconstrained and would take forever to do it myself, is there something I am doing wrong?
I am using Inventor 2012 btw

2 Answers

It sounds as if you have DL the STEP file for that model?
STEP files does not keep the constraints when open in other software... Try DL the IV version if that is an option?

Totally agree with William (Nice Profile Pic By the way!)
Also, I would sugest to keep everything grounded and create only constrains that are necessary...
For example if you want to create a drive constraint....
Otherwise I cannot see why to rebuilt the whole assembly if every part is already in the right position