Just a simple question which version of Android codework should I install 1r4u2 or 1r5?
It would be best to go with 1r5. You should always be able to find the suggested version packaged with the engine under the Engine/Extras folder. You can find more information on this forum post: Can I use NVIDIA CodeWorks for Android 1R5 instead of 1R4? - Mobile - Epic Developer Community Forums