I tried a few online and despite passing the initial stage (in offline) I get a message saying this version of Windows can't be upgraded.
@Beetlejuice7979 The OEM:SLP keys are enough to perform an "Anytime Upgrade" on Windows 7. Me and several MDL users did it numerous times back in the 7 era. @Enthousiast even validated the same a few years ago. You can also opt for UpDown8 and go though a bit longer in-place upgrade path.