Whenever i open either Construct launcher or the "C3LUpdater", they open bottom right of my screen everytime. how do i fix this problem
Are you using anything that could be considered out of the ordinary, on your end? Multi-monitor setup, OS running inside a VM, Taskbar on top or similar? Also how far off-center is it, few pixels or more?
From a technical standpoint it's fully relying on Windows for doing the window centering job. No clue why it seems to fail on your end. Usually if the centering process fails, Windows tends to put the app window on the top-left or bottom-right (if taskbar is on top).