Unfortunately I've already tried the suggestion in post #10,042 but without any success!The instructions are the same.
When does this message appear? The guide describes a dism install, so if you can get to the command prompt, then the installer is effectively bypassed, and there is simply no opportunity for that message to appear. Perhaps your installer is different from the one in my tests. In that case, post #10,042 may be helpful.
Maybe the last hope then is to do the upgrade from Windows 10 as described in post #63 of the thread "Bare Metal Windows on cMP".
Thanks!