No. YouTube does not allow batch downloading. Using third-party YouTube downloaders violates YouTube’s Terms of Service and may get your IP banned.
If you're looking for a convenient and legitimate way to watch Devon Ke Dev Mahadev, consider the following alternatives:
The mythological masterpiece stands as one of the most successful and impactful shows in the history of Indian television. Premiering on December 18, 2011, on the Life OK channel, the show ran for 820 episodes before concluding its historic run on December 14, 2014. Starring Mohit Raina in a career-defining performance as Lord Shiva, along with Mouni Roy as Sati and Sonarika Bhadoria as Parvati, the series brought the stories of the Shiva Purana to life with unprecedented scale, gripping visual effects, and soul-stirring music.
At 250 MB to 400 MB per episode, the total file size escalates to between 200 GB and 320 GB.