> For the complete documentation index, see [llms.txt](https://lync.gitbook.io/lync/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lync.gitbook.io/lync/introduction/pre-requisites.md). # Pre-Requisites ### Get Your API Key Please get your API key before downloading the SDK from [**here**](https://www.lync.world/form.html)
### Supported Game Engines The LYNC SDK is Compatible with Unreal Engine and [Unity](https://unity.com/). The Currently Supported Versions are: * Unity 2019.4.21f1 and above * Unreal Engine 4.27.2, 5.0.2, 5.0.3, 5.1.0 **(Unreal Engine plugins are still under development)**