# Downloads

> Reference: 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.

> This content was machine translated and may contain errors. [Read in German](https://www.traeger.de/docs/development/opcua/downloads)

Latest version v2.59.0, released November 9, 2026 ([version history](https://www.traeger.de/en/docs/development/opcua/version-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](https://www.nuget.org/profiles/Traeger.de).
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](https://www.traeger.de/en/docs/development/opcua/license-setup) 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. Files: [zip](https://releases.traeger.de/artifacts/Opc.UaFx.Advanced/any/any/latest), [nuget](https://releases.traeger.de/artifacts/Opc.UaFx.Advanced.nupkg/any/any/latest)

- **Opc.UaFx.Client**: Client API for applications that access OPC UA servers. Includes discovery, reading and writing, subscriptions, and access to historical data. Files: [zip](https://releases.traeger.de/artifacts/Opc.UaFx.Client/any/any/latest), [nuget](https://releases.traeger.de/artifacts/Opc.UaFx.Client.nupkg/any/any/latest)

## 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. Files: [zip](https://releases.traeger.de/artifacts/Opc.UaFx.Client.LabVIEW/windows/any/latest)

- **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. Files: [unity](https://releases.traeger.de/artifacts/Opc.UaFx.Client.Unity/any/any/latest)

## 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. Files: [zip](https://releases.traeger.de/artifacts/OpcWatch/windows/any/latest)

## 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. Files: [zip](https://releases.traeger.de/artifacts/Opc.UaFx.Advanced/any/any/2.0.1.1), [nuget](https://releases.traeger.de/artifacts/Opc.UaFx.Advanced.nupkg/any/any/2.0.1.1)

## OPC Classic runtime

To connect to OPC DA, OPC HDA, and OPC AE servers, install the
[OPC Core Components](https://opcfoundation.org/developer-tools/samples-and-tools-classic/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](https://www.traeger.de/en/docs/development/opcua/client/opc-classic) page
describes how the client works with Classic servers.

- **OPC Core Components**: Redistributables of the OPC Foundation for OPC Classic. Files: [zip](https://releases.traeger.de/artifacts/opc-core-components-redistributables/windows/any/latest)