UPDATE : GUYSSS it workedddd !!! . I Can't believe it . I thought it would still be a failure but what i thought about doing . Workeddd :) . So what i did was that . During the main installation page when you select your simulation : FSX , P3D Or FSX Steam . I Selected FSX on purpose even though i have P3D and then i manually navigated to the folder where i had P3D Installed and it workeddddd 😄 . So you can add this to your solutions if any other person has a similar problem . Select FSX on purpose and then manually navigate to the P3D Folder :)

Great that it works although I don't understand it because e.g. the aircraft.cfg many gauges are different in the FSX version and they shouldn't work in P3Dv4. Very strange. 

@FDEdev I mean , Everything works  perfectly except a small glitch on the cockpit where the ground is visible . I will put a photo here :)