Shockwave Error

On my old PC, I would play some online 3D games, which back then worked fine. I recently got a Mac and found out I could no longer play without recieving 2 error messages.
The first error message said:
Director Player Error

This application requires an Xtra (Havok Physics Scene) that either does not exist or failed to initialize properly. Please make sure the appropriate Xtras are in the Xtras folder(s).

I have no clue what Xtras are, and could not find any said "Xtras folder". After that error message, it would continue to load a second and then once it got to the game it would freeze and another message would appear.

This Shockwave movie has errors that have caused playback problems.
Please contact the author of this content regarding this problem.
Shockwave is unable to continue.

This one is a little easier for me to comprehend but, I have no clue how to fix it either.

If someone could tell me if I have to download or find something that'd be great, I'd like to play some of my favourite online 3D games again