Secunia alerted that I need to update GTK + 2.12.9 Runtime environment, which I need to run GIMP.
I downloaded the fix , which is GTK +2.24.0
It had a bunch of folders in the download. The first one is bin, and it contains an .exe file and some .dlls. Should I run the exe file over the old GTK installation? Or should I remove my current installation first?