For the lastest, up to date information, potential changes and service pack requirements, see this Microsoft list of .NET Framework Operating System Requirements.
Important - See the program's Prerequisites page for the list of Windows® Versions/editions and .NET Framework version supported by the product.
Microsoft .NET Framework is a pre-requisite which comes pre-installed on Windows 10/8. And can be downloaded and installed separately on Windows 7/Vista/XP (provided free by Microsoft). Updates to .NET Framework arrive via Windows Update.
When indicated on the program's Prerequisites page, these editions are supported: x64 (64 bit), x86 (32 bit) and "N" editions. Explicit exceptions are noted below.
NOT supported on: Windows 10 S (which restricts program installs to ONLY Windows Store apps). All Windows XP Media Center Editions. Windows XP Reduced Media Editions, Windows XP Tablet PC Edition, Windows XP Starter Edition.
Windows 7 must have service pack 1 (SP1) installed.
Microsoft ended "Mainstream Support" for Windows Vista on April 11, 2017. As of July 2018, withdrawl of support for Windows Vista began for some of our products since required level of .NET Framework is not available on Vista. Check the Product's Prerequisites page for a detailed list of OS support.
Development on XP versions of our software ended in late 2015. You can still install the final XP releases, but they will be missing new features introduced after XP development ended. See the program Release Notes for dates of final XP releases. For XP releases, you must have Windows XP Service Pack 3 installed.
We no longer provide customer support for our programs when run on Windows XP platform. Future program releases (including any new features) will NOT be regression tested to work on Windows XP. Customers should consider upgrading to a newer version of Windows. Microsoft officially ended support for Windows XP on April 8, 2014
The latest versions of our programs no longer require DirectX 9.0c. Consider upgrading to a new program version but be aware some specific DirectX features are no longer available in newer program editions. Contact support for more information.
The .Net Framework does run on many Windows Server OSes including many editions of Windows Server 2008 and Windows Server 2003. We do not test on those Server OSes and therefore do not officially support them. However, you can install the program and test it in trial mode on these OSes. Check the Server section of the .NET Framework Operating System Requirements.