The Microsoft Web Platform (Web PI) gives you the framework, web server, database and tools you need to build and run Web sites and applications on Windows and SQL Server.  Now the SQL Server Migration Assistant (SSMA) is included as part of Web PI selection below:

Once you select and click install, the SSMA tool will be downloaded and installed for you. Give Web PI a try and download from http://www.microsoft.com/web/platform/database.aspx