Interesting, I don't play games, but I'm all for preserving stuff.
It seems that if you change your user agent you can get the links.
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Shockwave 12.3.4.204 Windows Full Other Browsers
https://get.adobe.com/shockwave/download/?installer=Shockwav...
Shockwave 12.2.5.195 Full (OS X 10.6 and above)
https://get.adobe.com/shockwave/download/?installer=Shockwav...
Shockwave Player 10 for Mac PPC
https://get.adobe.com/shockwave/download/?installer=Shockwav...