Downs was knocked out and taken to hospital by ambulance. He returned a couple of hours later and batted for his team. However, it was in vain as Central were rolled for 175/8.
Indians will now meet Taupo Wanderers in the final on Saturday after they beat Geyser City in Taupo.
After losing the toss, the home side were sent into bat putting on 254/9 in their allocated overs. Ray How top-scored for Taupo with 103 and was helped out by Alex Davey 36 and Paul Chisolm 29. Caleb Powley was the best bowler for Geyser with 4/54.
Although Geyser battled hard, they were never really in the match. Chris Nairn was the best of the batters with 22 with Geyser's best bowler Sage Davey grabbing 4/11.
Scorers:
Taupo Wanderers 254/9 (Ray How 103, Alex Davey 36, Paul Chisolm 29. . Bowlers: Sage Davey 4/11, Armund Kushal 2/24) beat Geyser City 131/all out (Chris Nairn 22. Bowlers: Caleb Powley 4/54, Brad Munro 2/41).