The NDI Runtime is the essential software backbone required for any computer to send or receive NDI streams. Think of it as a driver or a language pack. Without the runtime installed, your computer cannot "speak" NDI. It will not recognize NDI sources on the network, and applications like OBS Studio, vMix, or Wirecast will not be able to transmit video over the network via NDI.
Disclaimer: This article is for informational purposes. Version numbers, URLs, and product specifications are subject to change. Always refer to the official NDI/Vizrt website for the most current information and security notices. Last updated: 2026. ndi 4.5.1 runtime download
If you have NDI 5.x installed, the uninstaller may fail. Use Microsoft's msizap tool or a clean uninstaller like Revo Uninstaller to completely remove all traces before installing 4.5.1. The NDI Runtime is the essential software backbone
With NDI 6 currently available, offering features like high-bandwidth NDI|HX3 and improved network discovery, why do so many professionals still search for an ? It will not recognize NDI sources on the
Since NDI 4.5.1 is no longer the current version, NewTek (now part of Vizrt Group) does not prominently feature it on their main downloads page. However, they maintain an official portal. Here is the safe path:
If the primary link is slow or down, you can find the installer listed under the assets of older obs-ndi releases on GitHub For macOS Users