I bought the Harrier. Yesterday I tried to update from DCS 1.5.7.1087 version to the latest, but then DCS stopped working without any reason. 
I tried repair, check-uncheck 'Run as administrator' but then nothing worked. 
Today I reverted to DCS 1.5.7.11762, DCS starts working again. 
So, there should be something wrong with the latest update. Can anyone help ? :(   
My system: Win10, i7 4790, 16 Gb Ram, 1070 Nvidia.   
Thank you all !