Thanks for the info, Ben. For samj’s portable, the extension won’t work, but if you dig for the GIMP executable, you can get this to work but none of the GIMP plugins will work (get lots and lots of errors, but eventually you can get to where you can enable n-point deformation. Not sure why, when you close GIMP and then run the portable shortcup, the n-point deformation is no longer there again. Oh well; will, again wait for samj to answer this query; there may have been issues that prevent this feature from being enabled for portable use. 