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Reference

Downloads

Packages of the OPC UA .NET SDK from NuGet and as ZIP archives, builds for LabVIEW and Unity, OPC Watch, the legacy build, and the OPC Core Components.

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Reference

Downloads ​

Latest versionv2.59.0released November 9, 2026Version history

Install from NuGet ​

For most projects, NuGet is the easiest way. For clients, Opc.UaFx.Client is enough. For servers and for OPC Classic, use Opc.UaFx.Advanced:

sh
dotnet add package Opc.UaFx.Client
sh
dotnet add package Opc.UaFx.Advanced

Both packages are available on nuget.org. Free, unlimited evaluation: the trial license runs for 30 minutes per application start. You do not need a license key for it. Your license key unlocks the SDK for production without downloading it again. The Set up the license page describes how to enter the key.

SDK packages ​

This section offers the same packages as ZIP archives or NuGet files, for example for computers without access to nuget.org.

Opc.UaFx.Advanced

The full feature set: client and server API and access to OPC Classic. Recommended as soon as you need more than client features.

v2.59.0 of Nov 09, 2026

  • ZIP Archiv35.1 MB
  • NuGet10.2 MB
Older versions (9)

Opc.UaFx.Client

Client API for applications that access OPC UA servers. Includes discovery, reading and writing, subscriptions, and access to historical data.

v2.59.0 of Nov 10, 2026

  • ZIP Archiv22.8 MB
  • NuGet5.8 MB
Older versions (9)

For special environments ​

Opc.UaFx.Client for LabVIEW

Preconfigured bindings to call the client SDK from LabVIEW VIs, with a sample project and mappings for the common OPC UA data types.

v1.3.1 of May 29, 2026

  • ZIP Archiv11.9 MB
Older versions (3)

Opc.UaFx.Client for Unity

Unity asset of the client SDK to bring machine data into digital twins, training simulators, or VR and AR applications over OPC UA.

v2.26.0 of Apr 13, 2022

  • Unity3.9 MB

Tools ​

OPC Watch

Standalone OPC UA client to browse, read, write, and diagnose, free of charge and without a license key. The tool for commissioning and troubleshooting.

v2.59.0 of Nov 10, 2026

  • ZIP Archiv8.9 MB
Older versions (8)

Older versions ​

Opc.UaFx.Advanced (.NET 3.5)

Legacy

Legacy build for applications on .NET Framework 3.5 with a frozen feature set. Maintained for existing integrations, not for new development.

v2.0.1.1 of Jun 07, 2017

  • ZIP Archiv8.9 MB
  • NuGet11.5 MB

OPC Classic runtime ​

To connect to OPC DA, OPC HDA, and OPC AE servers, install the OPC Core Components of the OPC Foundation on the target system. They contain the proxy and stub libraries for DCOM and OPCEnum for finding Classic servers. Systems that use OPC UA only do not need them. The OPC Classic page describes how the client works with Classic servers.

OPC Core Components

Redistributables of the OPC Foundation for OPC Classic.

v3.0.108 of Dec 20, 2019

  • ZIP Archiv7.1 MB
Older versions (1)