This is the official Apple method.
as part of Apple's transition to supporting Windows 10 on older hardware, such as Late 2013 iMacs. Resolution: bootcamp 60 6136 download full
You downloaded a version meant for a different Mac year. Fix: Delete the folder and redownload using Method 1 above directly from your own Mac. This is the official Apple method
after installing Windows: Boot Camp Assistant will prompt you to download the support software automatically. bootcamp 60 6136 download full