Downloaded months ago a HY-Poly blend from Blender Swap titled: "Large Muscled Man Division 3" by MatrixNAN Released with CC-0 License. Used it to learn rigging and weight painting. Used Blender 2.78a and found that due to the high poly count and intermesh for muscles, Auto-weight does not work like before. Finally figured it out that if you do it in 3 distinct sections the CRL-P Auto weight works fine as you build up the weight layers. Originally uploaded only the FK version. This now has the IK capability also.
I received it CC-0 upload this with the same license.