The Community Edition is free and is available for use in commercial projects, however, it does have a number of limitations in comparison with the Professional Edition
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Install .NET Forge CMS using Microsoft Web Platform Installer.
Includes: Bitrix .NET Forge CMS, .NET Framework 3.5, Microsoft SQL Server Express 2005.
Installation only of the product (.NET Framework 3.5 and SQL Server 2005 additionally required)
An archive with .NET Forge CMS modules source code.
How to install the system and start using is contained in the Documentation section.