Hi Lee Jae Guen,
Just a little more info about the uninstall of 3.5 if you still have it running and have not put v.4 on top of it.
1. Go to the Commands menu and choose EDAPT Control Panel or press [ Alt+F1 ]
2. When the panel opens click Uninstall EDAPT button at the bottom left
There will be a confirmation and Animate will close and 3.5 will be uninstalled.
Then you can safely install v.4
If you have any difficulties, please, let me know and will help you with all this.