If you insist on having the MP4 files saved to your hard drive "forever" with the best possible quality, follow this legal workflow:

Subscribe to ZEE5 (Monthly plan ~$1-3 depending on region). Step 2: Download the ZEE5 mobile app on your smartphone or tablet. Step 3: Search for "18 Jaan Bujh Kar" -> Select Season 1 -> 2022. Step 4: Tap the "Download" icon next to each episode. You can choose resolution (High = 1080p, Medium = 720p). Step 5: Watch offline.