We have just uploaded a new batch of SolidWorks plugins. Notice that we have now 2 versions: 1.x works with KeyShot 3, and 2.y works with KeyShot 4.
This most recent update fixes some crashes that we have seen, as well as cleans up the UI.
Download here:
KeyShot 4 w/ Live Linking
http://keyshot.com/install/plugins/solidworks/keyshot4_solidworks_plugin_2.0.exe
KeyShot 3
http://keyshot.com/install/plugins/solidworks/keyshot3_solidworks_plugin_1.5.exe