This is similar to this previous question, but for a tv rather than a phone.
My smart TV is made by Intex (India) and as per guides, runs Android 5.0. There are some inbuilt apps and an 'Intex play store', not the Google Play store. I would like to install other apps from Google Play Store. How do I (a) install play store, or, (b) install apps without play store?
Note: (1) I am unable to install other repositories such as F-Droid also.
(2) I was not required to sign into a Google account the way you would on an android phone.