Issues trying to use TransMac to create bootable USB from Windows 10

I'm trying to follow the steps in this post: https://apple.stackexchange.com/questions/448120/how-can-i-use-windows-to-create-an-os-x-el-capitan-or-macos-sierra-usb-flash-drive Which was answered by David Anderson. I'm on step 7 and cannot 'copy here' any files from my downloads folder and also cannot rename or delete any files from within the USB drive in TransMac. I have been trying to make this bootable USB for days now following different guides and this seems like the best and most detailed one but I'm just stuck on this bit because I can't get it to work.