Father-in-law's uses Mobdro on his TV, It stopped working and needs an update, However when trying to update the INSTALL button is greyed out.
Uninstalled the app and tried reinstalling and the install option appears to be grayed out for all APKS.
https://i.imgur.com/WeBQfft.jpg
EDIT: Spoke to Philips who informed me they have released an update that fixes the issue of installing from APK, I had received a software update that caused the bug but had not yet gotten the next update which solved the bug.
All is now working again as it once was.
Question on @Quora: What are the best 4k UHD non smart TVs launched in 2018? https://www.quora.com/unanswered/What-are-the-best-4k-UHD-non-smart-TVs-launched-in-2018?share=1bf3ef69&srid=nxRN