This is the primary home for the series. You can find the complete collection on Disney+ Hotstar India and other international versions like Hotstar US .
Finding a completely "free" legal source for the entire series can be challenging, but there are some workarounds:
Devon Ke Dev...Mahadev - streaming tv show online - JustWatch
While the entire series isn't typically hosted on one official channel for free, select full episodes like Episode 1 can sometimes be found on official network channels or aggregated playlists.