You need to copy the Core and JCarousel folders. Also you need to update the view of the JCarousel, because we made some modifications for better performance and more readable code. The JCarousel contains only one view so it will not be hard, even if you have changed it.
After you update the plugins you can change the Global.asax file. Just download it from your website, add a space after the code, save it and upload it again.
I will be waiting for your update on this problem.
I just tried this, and I also used the the new views. The only folder I used from the previous release is my modified themes folder. I copied the contents of the new core folder as well. After that I added a space to the global asax and restarted the website in IIS.
Still getting errors, this time right when I go to the home page.