The official Rajshri YouTube channel has released the movie in parts. While these may not always have hardcoded subtitles, you can often use YouTube’s "Auto-translate" feature by clicking the CC icon and selecting English in the settings.
Look for the "Subtitles: English" tag in the movie details before finalizing your purchase. The Plot: A Case of Mistaken Identity watch main prem ki diwani hoon with english subtitles