Hi Chien Cheng Lai,
Please make sure that you unblock the assemblies from the zip file. Windows doesn't trust them, as they're downloaded from the Internet.
The way to do this:
Before extracting the zip file, right click it, select "Properties" and then select "Unblock".
Then you can extract the file and open the solution.
Feel free to contact us should you have any other issues or problems.
the Telerik team