You will need to find where the Kontakt installation put your Kontakt 5 dlls. In my case they are under Program Files\Cakewalk\Vstplugins. In your case I suggest you go to your program files directory and search for Kontakt. Then note where the Kontakt 5.dll lives and add that directory to Reaper as per the earlier messages.

Tony


HP i7-4770 16GB 1TB SSD, Win 10 Home,
Focusrite 2i2 3rd Gen, Launchkey 61, Maton CW80, Telecaster, Ovation Elite TX, Yamaha Pacifica 612
BB 2022(912) RB 2022(2), CakeWalk, Reaper 6, Audacity, Melodyne 5 Editor, Izotope Music Production Suite 4.1