are older versions of Photoshop available?

I've been doing some Photoshop work on my old G4 but it may be giving up the ghost. I am using an early version of Photoshop and it's doing the job but if the G4 goes so does the software as it came on the unit when I bought it used. I'm considering my options with a limited budget. Are older versions available? I've seen reference to some and they appear free but I don't know if they are legit. I'll continue my researching but if anyone has any ideas or suggestions, that'd be great.

thanks!

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