Gimp portable- install & adding brushes – Gimp on a flash drive
GIMP portable, GIMP on a flash drive. You do not need to install GIMP to use it on a Windows computer, you can just put GIMP Portable on a flash drive and use it anywhere as portable application.
I also tell you where to install your brushes and plug-in and scripts.
link to download:
http://portableapps.com/apps/graphics_pictures/gimp_portable