GIMP Photoshop Layout can be used with both the installer and portable versions of GIMP to provide you with a more photoshop-like layout.
If you like the layout of Adobe's Photoshop but prefer to use GIMP then this is the utility for you. It makes the layout of the right-hand toolbox more closely resemble the layout of Adobe Photoshop. This is intended to make GIMP easier to use for those already familiar with that layout. Some items had to be moved (Brushes, for instance, since GIMP doesn't have a top toolbar). Others had to be combined due to lack of space. But users should find the layout close enough even with those minor changes to add a nice enhancement to GIMP.