2.7.1 is the latest version, installing 2.6.9 will not uninstall any other GIMP programs you have installed...HOWEVER...
downloading and installing GIMP 2.7.1 WILL uninstall all previous 2.6.9 versions you have installed.
the problem with 2.6.9 is the combo boxes, you crash GIMP if you use the selector scroll bars in any of them.You can use your mouse wheel to select without any problems though.
i decided to just dl and install 2.7.1 for Windows, runs great and has single window mode, and is python enabled.
if i had a choice to run either 2.6.8 or 2.6.9 id choose 2.6.8 myself. =)
2.6.9 had no new changes, just bug fixes and one of those fixes caused the combo box crash.
as for language change you have a choice to either choose language on install, or
Control Panel → System → Advanced → Environment button in “System Variables” area: Add button: Enter LANG for Name and fr or de... for Value. Watch out! You have to click on three successive OK to validate your choice.
If you change languages often, you can create a batch file to change the language. Open NotePad. Type the following commands (for french for instance):
Save this file as GIMP-FR.BAT (or another name, but always with a .BAT extension). Create a shortcut and drag it to your desktop.
Another possibility: Start → Programs → GTK Runtime Environment Then Select language and select the language you want in the dropdown list.
you can find these directions at the gimp manual site also..chapter 2 - 1.2http://docs.gimp.org/2.6/en/gimp-fire-u ... g-language
hope this helps