According to XDA it is not possible to side load APKs as the TV does not allow unknown sources to be loaded.
There is a guide to root the TV too allow foriegn APKs, but that is unknown territory for me.
https://forum.xda-developers.com/android/help/philips-android-tv-t2935545/page65
ROOTING: https://forum.xda-developers.com/android/help/guide-how-to-root-2015-philips-android-t3323912