Boot camp install fails - need 64-bin windows 10 or later iso file

Tinyvaldemar wrote:

Media Creation Tool is the only supported way to download an ISO from Microsoft AFAIK.

No. That is incorrect. Windows MCT only works on a PC running Windows. if you use any browser in macOS, you cannot run MCT. The only option you have is to download the full ISO.

As a note, I do not create a startup disk, only downloading the windows.iso file.

That depends on your model.

• 2011 and older models need
  • a physical DVD for models with built-in Optical drives
  • an external Apple Superdrive or a USB2 Flash drive for Macs without built-in Optical drives, depending on the model
• 2012-2014 models need a USB2 Flash drive of 16+GB
• 2015 and later models do not need an external Installer, but use OSXRESERVED partition on the internal disk, to build/install Windows

Tinyvaldemar wrote:

Unfortunately that did not work for me. I Downloaded the ISO using the official Media Creation Tool from Microsoft and copied the ISO to my new IMac.

Windows Media Creation tool should not be used for Macs. You will need to directly download the ISO from Microsoft to the Mac's internal disk in any folder except Downloads.

Same error: Bootcamp requires a 64-bit version. I verified that this is a 64-bit version and also installed it on Hyper-V in Windows to make sure.

Windows MCT files will work on a PC and your test is fine.

See

Welcome to Boot Camp Assistant on Mac - Apple Support

Install Windows on your newer Mac using Boot Camp - Apple Support

Install Windows 10 on your Mac with Boot Camp Assistant - Apple Support

for reference.

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

Unfortunately that did not work for me. I Downloaded the ISO using the official Media Creation Tool from Microsoft and copied the ISO to my new IMac. Same error: Bootcamp requires a 64-bit version. I verified that this is a 64-bit version and also installed it on Hyper-V in Windows to make sure. Any suggesiton is appreciated

Use a wired connection and download the ISO directly on the Mac side from https://www.microsoft.com/en-us/software-download/windows10ISO .

Post the name of the ISO and the MD5sum.

Can you get to https://www.microsoft.com/en-us/software-download/windows10ISO? If yes, do you see this...

Excellent!

Media Creation Tool is the only supported way to download an ISO from Microsoft AFAIK. As a note, I do not create a startup disk, only downloading the windows.iso file.

This is the latest iMac. MCT download of ISO does not work which is a shame. Downloading an insider preview ISO works.