Warlord Games does provide several for Bolt Action, but the complete 2nd Edition rulebook is not among them. The official 2nd Edition rulebook is a commercial product available for purchase both as a physical hardback and as a digital PDF from the Warlord Games webstore.
You can get this directly from the Warlord Games website or via DriveThruRPG. This is the available. bolt action 2nd edition rulebook free pdf 2021