Eazfuscator.Net is now paid. With the continuous development, the product got so competitive that the authors decided not to just offer it freely.
Download Eazfuscator.Net 220.127.116.11493 (last free version).
How to make Eazfuscator.Net 3.3 work with Visual Studio Express 2012
If Eazfuscator doesn't find the ildasm.exe in Visual Studio installation, go to
C:\Program Files\Microsoft SDKs\Windows\
Look for ildasm.exe and copy it to
C:\Program Files\Microsoft SDKs\Windows\v6.0A\bin\
You'll need to create the missing folders if any.
Mind that Eazfuscator 3.3 (free) does not support .NET 4.5 and WinRT.
If you want to obfuscate your .Net code, you can also check out the following products, that are either free, or offer a free and more or less up-to-date version:
Happy obfuscation :)