Here is the hard truth. Most websites offering direct downloads of old Star Utsav serials (via FileLinked, Telegram channels, or Torrent sites) are operating in a grey or outright illegal zone.
Table_title: List of Old Star Utsav Serials Table_content: header: | Old Star Utsav Serials | Main Actors | Genre | row: | Old Sta... Star Utsav Old Serials and TV Shows List – Airtel DTH
This is the official home for all Star India content. Hotstar hosts almost every major serial that ever aired on Star Utsav.
For shows like Shararat and Shaka Laka Boom Boom , Moser Baer and other companies released official DVD box sets in the late 2000s. You can find these on eBay or OLX. Ripping your own DVDs to your hard drive for personal backup is legal in most jurisdictions.