When you install Microsoft Visual Studio 2015 Community edition and start using it , there are times when you would get an message stating the following.
License: Prerelease license.
This license has expired.
How to fix the License expired error after installation of Microsoft Visual Studio 2015 Community ?
Microsoft Visual Studio 2015 Community edition is a free version , but it is needed for you to sign-in to the Microsoft account when you are using it for more than 30 days.
Just login with your live account from Visual Studio and you are all set to go.