The old installer won't work.
Regarding the brakes, nothing was done to them in this update, so this is something isolated to your PC. Before checking anything further, make sure you are applying brakes, and THEN apply park brake. Otherwise, they won't work. Failing that, please check all key strokes/button presses. Check the maintenance manager to see if the brakes have failed.
If. none of that fixes the problem, you may need to create a new airframe.
And what @Pivot said