Image file is located on an External File

Hi,
I just bought Windows 10 Home Edition, to be installed via Parallels latest version. Now the problem is I want to install windows on an External HardDrive, not on my actual SSD from my Mac. Is that even possible, I get to a point where I get No image file.
See the first screenshot. After that, I have copied the Windows 10 image file to my desktop, and the same thing happens, why is that?
So far this was the worst product I ever tried. I paid for it and it doesn't even work!
And yes I read that FAQ article about No images are available and it didn't help at all, the image is not mounted.

Thank you in advance

Best Regards.

 

The solution was really simple, install like the documentation stated, but uncheck - this product needs an activation key, then the windows will install without any issue, after that activate the windows with the key Microsoft have provided - you should really check into that.

 

If you have downloaded a single language ISO or an N-Type ISO instead of normal Windows 10 ISO this issue happens sometimes at that time, you can complete the installation by just disabling the express installation in Parallels Wizard.