After updating GSX to 3.7.1 (Latest version as of now), it still shows as not updated.
It seems that the culprit is manifest.json located in FSDT\Addon Manager\MSFS\fsdreamteam-gsx-pro\ in which it still says 3.7.0 after updating.
Manually changing to 3.7.1 inside of manifest.json solves the issue.
This is probably a small bug, but nonetheless, i tried updating with installer first, then with live update until i realized what was going on...