Question is, are all versions of FSX Delux Edition the same. Whether you bought early or later, were there any changes to the software that might effect the way it operates with Windows 10 ?
I don,t see all the options that are called for when loaded, particularly when trying to download and use Carenado aircraft software.
There were no changes just 2 patches, SP1 and SP2.
If you buy The Acceleration Pack it has new features and has SP1 and SP2 built in...it works much smoother and uses all cores of your CPU.
Without the patches you aren't using all cores.