They're all free. GIMP will always be free - it is an open source program created by people that love the Linux world. GIMP = Awesome.
GIMP is made under the GPL GnuPublicLicense.
That license states that it is open source (means everybody who cares can see the programming code) and it's not made by a company but by a team of people who ask you to donate.
Thus you can legally download GIMP - all versions of it - from the producers website and use it for completely free.
But: it would be nice if you donate money, so they can finance any further development work.
GIMP is available for Linux, for Windows and for the Mac.
see www.gimp.org for further information.Dialing *86 on cellphone?
Thanks a lot :)
I don't know about all versions, but mine is free