Fail to install windows 10 with bootcamp

Hi,

I’ve been trying to install windows 10 through bootcamp with no success, I followed every treads that I could find on internet and even called with an apple support advisor without any success.

I’m running the latest version of Mojave and I got the .iso Windows 10 0803 from Microsoft page. Once I finish all the steps with BCA, with the bootcamp driver and the windows 10 installed on the USB key, tried 3.0 and 2.0, my mid 2015 iMac restart and I got this error :

I tried after that the Option key while booting and tried each Windows and Efi partition, and I got an error “ Windows can’t be installed on the disk. The selected disk is of the GPT partition style”

I don’t know what to do with that and I spend 2 evening figure it out, it’s driving me crazy!

If anyone know what’s going on, your helps would be appreciates!

thanks in advance!