The official StarPlus channel has a comprehensive Iss Pyar Ko Kya Naam Doon - S1 Playlist containing hundreds of full episodes.
The versions on Hotstar are the TV broadcast versions. The fabled "uncut" scenes are mostly available on YouTube as fan-uploaded clips, not full episodes. iss pyaar kya naam doon season 1 all episodes free top
If you want legal options, I can:
Riya froze. That was her voice.