FYI this is what the Real Flight web site says about the 12th gn computers. The integrated graphics processing unit (iGPU) in Intel’s 12th-generation processors is currently incompatible with RealFlight.
To be clear, these Intel CPUs are just fine as processors. There is only a problem if you are also using them to render your graphics. The iGPU is missing support for a particular DirectX 9 feature subset that RealFlight requires.