Windows 10 on 2011 early

Hi,

New to MacBook Pro so please need all the help I can get.

Purchased Windows 10 from MS and downloaded (Win10_1511_English_x64.iso). I have tried to copy to 8GB USB stick and a 500GB external Hard drive, formatted to MS-DOS (FAT) Scheme Master Boot Record, (I did try all the scheme options), but neither work.

Start Boot Camp, it allows me to download the latest Windows support software from Apple, but at "Install Windows 7 or later version" it pops up "The installer disc could not be found". I'm getting very frustrated, but I'm sure it is something simple that I'm doing wrong.

MacBook Pro 13 early 2011, 2.7 GHz Intel Core i7, 4 GB memory, running OS X El Capitan.

Apple says my computer does not support Windows 10, however on searching this support forum, it seems many are running 10. I talked to support at MS and asked if I could purchase Windows 7, but was told only 10 available.

MacBook Pro, OS X El Capitan (10.11.3)