I have downloaded the xplane 11 demo and installed it to my main hard drive, to C:\programfiles(x86) to be exact.
I can get as far as playing the game but I get lots of messages saying that particular files cannot be read or saved, including the joystick calibration.
The messages say to check that the files are not set as "read only", so I have changed that attribute in Windows for that directory (and it's loads of files!) but still the issue persists.
I am running Windows 10 64-bit, can supply further info as necessary.
Royal Wootton Bassett, UK