Instead of installing an old, insecure player on your modern OS, use Flashpoint. It is a massive preservation project that includes Shockwave 8.5 components in a secure, self-contained "browser" environment designed specifically for classic web games.
Shockwave Player 8.5, released in 2001 by Macromedia, is a legacy piece of software
: The gold standard for web preservation; it includes a pre-configured environment for Shockwave.