From all my successful and unsuccessful (is that right - not successfull??) attempts to install Windows 10 on my unsupported PCs, I recommend that the ISO route is used, which is best installed immediately after download.

Download to hard drive and extract to a new folder. Download an appraiseres.dll file with all referenced to TMP and UEFI removed, and replace file in sources folder.

Install from setup file.

Checking PC should then be bypassed.

I found that an ISO downloaded on a previous day would not install for some reason!!