#80 [4.0.1] Installer doesn't warn for a running prev. version

Version: 4.0.1
OS: Windows XP

When installing the new release of Tribler (4.0.1) over the old one (as recommended by Tribler 4.0 itself) the installer

a) doesn't tell me I should close any running instances of Tribler
b) doesn't check wether I'm running instances of Tribler
c) just gives a nasty "Error opening file for writing".