Bootcamp drivers for windows 10
David Anderson's comment is on target, some Macs do not support Windows 10. Annoying but true. So we gotta know what Mac you have.

As an aside you can download the bootcamp.app and then right (or control) click on it and "Show Package Contents." There will be a .zip file in there somewhere (possibly an .exe, sorry it's been a while...) with all the drivers in it that you can then copy to the Windows partition and install. But that working will depend on if that package has the drivers for your specific make and model of Mac.

Also some people have had luck going into device manager in Windows and finding the make and model of the "missing" hardware and installing "generic" versions of those drivers directly from the manufacturers website. EG A video card from NVidia you would get off the NVidia website, not Apple's.