Windows 10 was installed on Drive C. Drive E and F are almost full. I decided to downgrade to Windows 8, and made a bootable USB stick of the same. I'm a linux guy and my windows skills are rusty at best.
I booted using the Windows 8 stick and chose "Custom Install" and formatted my C drive. The installer then notified me that the drive isn't GPT and needs to be converted from MBR to GPT, which apparently requires a complete format. The "Regular" install option (which I glazed over) asks me to run the setup utility from the windows desktop(R.I.P).
Apart from copying my data over to another drive and installing Windows 8 after formatting the drive, the only other options are using Windows 10 recovery media or somehow mimicking the windows desktop to run the installer with the "Regular" option. Are either of these alternate cases viable? Can Windows 10 repair media "repair" my C drive? Can something start the "Regular" installer without repairing my C drive?