Q: Partition installation fail

the HW:

Macbook pro, middle 2015, 256 GB SSD, updated to El Capitan.

Windows OS Home edition, on USB flash disk, write protected. Bought new yesterday.

I created an ISO file from the Win10 USB in the Disk Utility. The file is named WINDOWS10.iso and located in 'Documents'.

I appreciate the attention and any suggestions.

The default choice in Boot Camp Assistant was to 32GB for the windows partition

yes I have still above 100GB free on the mac and I even tried to give Windows more, 48GB.

I will try see permissions as you suggested

Didn't find any "permissions".

I doesn't work yet..

10 days past...

the problem was found and solved.

The ISO file was not good.

Conclusions:

1. Apple's help files for Bootcamp are not up to date. I was using bootcamp 6.0.

2. The process of how to create an ISO file from OS disk/USB, from Apple, is not up to date.

3. Windows web-sites were down that day and time (coincidental).

4. When Windows sites came back and an ISO file could be download, the problem was solved.

5. Not even Apple supporters over the "chat support" could recognise what is the wrong thing/part.

6. I think Windows10 is not good and ready yet. I will probably revert to Windows8.1 if I could.

Thanks for the help.