[Eyestorm]

This is realy easy.

First you install Sedoys ISTA. Use the installer and you dont have to think at all. Program is doing everyting for you.

Download ISTA-P 3.69.0.400 and unzip whit 7zip og winrar to folder "C:EC-Apps".
When that is done you copy ISTA-P Loader into C:\Program Files. Run C:\Program Files\ISTA-P Loader\BMW ISTA-P Loader.exe. Enter the license key from the Activation Key.txt file in the same folder, and click Continue. After that ISTA-P Loader closes. Start ISTA-P Loader again and select Manual Search. Choose the path ISTA-P installation. In your case "C:EC-Apps\ISTA-P.