Installing the .NET Framework 3.0 June CTP;
To start the installation process, you will need to run the download file; this
will initiate the installation of the .NET Framework 3.0 June CTP; If you
have troubles with the download manager, you can download the entire package
or for x64
which are both .EXE files. Note: June CTP is an English only CTP. If you are installing the June CTP on an OS other than English, German and Japanese, please use the full redist packages (link above).