Can't install windows through Boot Camp Assistant

Hello Reddit, I had freshly downloaded the windows 10 from official website, it is indeed x64 yet bootcamp is showing this error. I also have a different modified windows 10 iso from ghost spectre, 64 bit, still showing same error. I believe it's because of the MacOs I'm using but I'm new, literally installed it yesterday so I really appreciate it if someone could help. Thanks

(*) I haven't used normal method because my internet is not ideal to download 8Gb at home.

Tutorial I followed: https://youtu.be/mwcsKGvS6uo

Error I'm facing: https://i.imgur.com/VeqNKhF.jpg

Please help this poor soul....