I got Tycho's final upgrade, but I couldn't get the other two because I couldn't collect enough parts without going to the World's Fair. Once I was there and got enough for one of them, though, I went back to Anne-Claire's room, and she was gone. How are you supposed to get the upgrades?
Also, I never found Gabe's item. Go ahead and spoil it for me, I suck.
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Also, the item you have to find for Gabe's final upgrade are a pair of manacles in the Sanitarium's dungeon.
Gamertag: PrimusD | Rock Band DLC | GW:OttW - arrcd | WLD - Thortar