The OPC UA .NET SDK is built with selected Microsoft Frameworks.

When installing on Windows systems, you can choose between the following six variants of the SDK for the various Microsoft Frameworks:

• .NET Framework 4.5
• .NET Framework 4.8
• .NET Standard 2.0
• .NET Standard 2.1

Depending on what you choose, the setup will install Visual Studio 2017 or 2019 project files and pre-built applications matching your choice. The Visual Studio projects for .NET Standard are built for .NET Core 2.1 or .NET Core 3.1. .NET Core 2.0 is end of life, so we do strongly recommend to use .NET Core 2.1 instead of .NET Core 2.0 as target framework.

However, independent of your choice, Nuget packages including all supported versions can be found in [Installation Directory]/packages. It is possible to install another version of .NET Framework, change the settings in the Visual Studio Project and build against this .NET Framework.