Hey, sorry about not getting back to you sooner. I checked our legacy unity webplayer code and noticed it was using a misconfigured cache. I've removed the issue. I don't have webplayer available for my OS to test, but try it out again and see if it's working for you now.
Regarding time left, none of these game files are going anywhere. They will continue to sit on our server, and if in the future a more reliable way to run unity3d files exists then we can make them available using that method.
Thanks