Can't install Windows 10 on my Intel Mac with bootcamp

100GB of space is enough, there are many restrictions on using bootcamp to install Windows 10 on the intel Mac. Here are a few tweaks you can make to your Mac before installing Windows 10:

1. Turn off FileVault on your Mac. Because FileVault is a built-in encryption feature capable of encrypting the entire system drive, if FileVault is enabled, Windows will suffer from slow performance and prolonged startup times when working on a Mac.

2. Update macOS to the latest version (such as Ventura or Monterey). The latest version of Boot Camp is optimized for the latest version of macOS for better performance and stability.

If bootcamp fails again for you, I recommend you an easy way. UUbyte ISO Editor as an alternative to Bootcamp can help you create a Windows 10 bootable USB on Mac. After that, you can use this bootable USB to install Windows 10 on Intel Mac. I used this app two times and it worked nicely on my Mac.

For more detailed steps, go and take a read from this page:

https://www.uubyte.com/blog/failed-to-install-windows-10-on-intel-mac/

If you want to successfully install Windows 10 on Intel Mac using Boot Camp,a few points to pay attention to:

Make sure that there's enough free space on Mac. Cannot be less than 150GB.

A complete Windows 10 installation media.

Turn off FileVault on Mac.

Upgrade macOS to Ventura or Monterey.

Some underlying factors cannot be listed one by one.....

Obviously Boot Camp is not the best approach to install Windows 10 on Intel Mac, sometimes it complicates the problem, you can try other alternatives.

The more space available on your Mac, the better, the better. Since both macOS and Windows will be installed on separate partitions. Sufficient free space provides them with some empty buffers.