BootCamp not working of El Capitan

• macOS High Sierra and older version(s) have issues handling W10 1903 and later ISOs. See https://twocanoes.com/using-larger-windows-10-isos-with-boot-camp-assistant/ for reference.
• You need to use a USB2 Flash drive. USB3 devices will not work.

What is the year/model of your Mac (do not post the serial number)?

ToddKmiecik wrote:

And also why is it necessary to burn it on a dvd. Could I install windows 8 with boot camp then upgrade it

The firmware on your 2007 Mac supports booting Windows from a DVD, not a USB. The firmware emulates BIOS using a layer called CSM-BIOS. This layer supports a DVD boot. However, if you want to install macOS, you can use a USB.

ToddKmiecik wrote:

Is there any way to burn it to a flash drive.

No.

Or do I need a dvd.

You need a reputable brand of DVD-R SL blank disc for W7/W8.1. Steps you need to burn the DVD are

• Right-click on ISO, and choose Burn
• Expand the Burn dialog
• Choose the lowest Burn rate to avoid buffer errors
• Enable Verify and Mount options
• Burn, and ensure that the DVD mounts and will show you installation files.

ToddKmiecik wrote:

Will it work if I burn windows 10?

No, because W10 is not supported. You can try it, if you want to waste a blank disc.

ToddKmiecik wrote:

Also I don't think I explained it very well. I had an error saying "Bootable USB could not be created. There is not enough space on your disk." So I opened the Windows 10 files and I manually copied them into the USB. I then could make a partition for Bootcamp and when it was done it successfully restarted my computer.

This is the same as my first point.

It then says No bootable USB found. Insert a key then try again. When I go back to Mac I have the partition created but it does snot have any files on it.

This is related to my second point. You can check if it is USB2 or USB3 by checking About This Mac -> System Report -> USB -> [Your Flash drive]. It should be 480Mbps.

ToddKmiecik wrote:

My usb says version 1.27 and it says up to 480mbps. It is a SanDisk Cruiser.

Good!

If you choose to stay with El Capitan, I recommend using the method in the TwoCanoes link, and rebuilding the USB installer via BC Assistant. BCA does more than just copying of files.

W10 is not officially supported on Macs older than 2012. You should first try to install W7 or W8.1. I recommend you try W8.1.

• Download W8.1 ISO from Microsoft.
• Burn it to a DVD . You can only install W8.1 32-bit. If you need detailed steps, please ask.
• https://www.howtogeek.com/187525/how-to-perform-a-clean-install-of-windows-8.1-with-a-windows-8-key/ . You can edit ei.cfg and install it without a key and activation.
• Once you have W8.1 fully functional, you can then run an in-place upgrade to W10 32-bit. This will allow the W7/W8.1 drivers to be grandfathered and allow it to function properly.