Trying to install Windows 10 on iMac

If your iMac is older than 2012, the best path to get to W10 via Bootcamp is to first install W8.1 (without activation), and then running an in-place upgrade to W10. The in-place upgrade does not have the same restrictions as a clean install of W10 from an ISO file size perspective. It also grandfathers the W8.1 drivers correctly, allowing your Apple hardware to work properly.

macOS High Sierra and older versions do not work properly with W10 1903 and later ISOs. See https://twocanoes.com/using-larger-windows-10-isos-with-boot-camp-assistant/ for reference.

Are Bootcamp drivers installed?

Install Windows 7 on your Mac using Boot Camp - Apple Support has the drivers which are valid for W7/W8.1. Select your specific Mac model. for the correct drivers. You can check and verify the System Requirements section.

agnesysabel wrote:

Thanks! I got it to run on Windows 8.1 pro, but now I can’t seem to connect to the internet without an ethernet cable. Unfortunately, I don’t have one nor am I willing to go out and get one. Would you know how I can get the mac to connect to the wifi while booted from Windows? I have a pretty strong connection, but the Wi-Fi option itself isn’t even available anywhere.

In the File Explorer, Go to OSXRESERVED And open BootCamp, And open Setup.exe

or follow this article

If the Boot Camp installer doesn't open after using Boot Camp Assistant - Apple Support