Q: bootcamp windows 7 64 bit support software setup this version is not intended for this computer

Late 2013 fusion iMac trying to install windows 7 64 bit via bootcamp have finally loaded windows but cannot get the support software downloaded. I've tried a couple of different downloads but i get the message this version of bootcamp is not intended for this computer. Help please spent many hours on this. It's the hardest thing I've ever attempted on a computer. OS X Yosemite 10.10.3