He is hiding in the attic of the Club, but you can't find him right away. Get the toolbox from the Boutique roof, go to the factory and fix the belt, to get a fan, which you can use to cool the robot Club owner. Take the nickel he gives you to the homeless guy past the factory.
After you get the heat vision goggles, go upstairs in the nightclub, past the "robots only room" and look in the ventilation shaft above the bar at the far left using the goggles. Then you can go outside and enter the small door at the upper right side (use the fan to fly up).
Once you find the inventor with the heat vision googles, exit the night club and go up to the entrance to the heat vent outside. Use the toolbox to unjam the door and chase him.
find him
After you find him in the attic he is on the roof of the nightclub. Hope that answers your question. :)
You find the inventor and get the helicopter. However, you can't ride it.
Just go on YouTube and you might get even more info.
When you complete all the game shows Holmes will tell all the robots to look for you. You walk into town and run to the manhole and jump down where you will find the inventor guy waiting.
You don't need to find it. After the inventor gives you the jet remote, simply return to the ground and press USE. Then click on the jet that comes and fly to a destination.
the inventer gives it to you
You only find Holmes after you beat all of the game shows. Return to Main Street and the Inventor will tell you to come down the sewer. Go right across the building and then jump down. The Inventor will give you some code to repair Holmes' programming, but you have to go through several "code circuit" challenges to reach his central processor.
Once you have beaten all of the game shows, go back to Main Street in the jet, and climb across the roof to the right so you can jump down to the manhole. The Inventor gives you the computer program on a thumb drive.
There is no AC, you have to go to the factory.
On Game Show Island, you don't need to find it in order to complete the quest.
it leads to the door on the outside of the club