Download Free Vst Crystal by Green Oak
If you don't see anything when you unzip this file, be sure to turn on the display of .dll files: Go to "Folder options" in windows explorer, select "View" and turn on "show hidden files and folders". See the readme file for instructions.
Depending on your Safari preferences, the installer may not automatically run after you download it. If not, just double click on the installer to install Crystal.
Note that when using the Audio Unit version on the Mac, Crystal 2.5 requires a host which supports Cocoa plugins. Almost all Audio Unit hosts on the Mac do support Cocoa plugins, but if you're using an old version of your host and having trouble getting the plugin window to display, that might be the problem.