Hi,
A look on InstallShields site doesn't lend good hope. It is going to take me some time to see what I can find as a solution. One statement implies that the latest version I have updated (a few days ago) which is V3.64B1 may install over the current version.
Come to find out, there is an installation cache and some bugs in the Installshield application still refer back to that even after a full uninstallation.
Please try the latest version, you download it in the same location as you got V3.63.
-Maze Creator