You are out of luck with G4, look at the their website for system requirements:
Minimum requirements:
OS X 10.5 64 bit Intel only, OS X 10.6 32 and 64 bit
You can either try to find a very old version, if they had any for G4. But Dont worry if you cant use it, I had latest version on my Intel MBP and it slowed system down so much that I could barely use it. Lags were everywhere so I deleted it.
Bittorrent is my advice.