Q: Issues with windows support software for bootcamp

Ok I have a mid 2014 macbook pro. I am trying to use bootcamp to put windows 7 also on my hard drive. I have created the usb with the iso and since its windows 7 I have to download the support software through apple's website which I did and I followed the instructions to put it on the same usb. So I started up bootcamp again and its still saying it cannot detect any support software. So I'm trying to figure out what I did wrong. Thanks