On Visual Studio 2022 I was getting a System.Runtime not found error everytime the project loaded up.

After a little investigation it turns out development of SpecFlow has been discontinued. (see https://reqnroll.net/news/2024/02/from-specflow-to-reqnroll-why-and-how/).

The Visual Studio plugin for SpecFlow is out of date, you can download and install the last released version from https://github.com/SpecFlowOSS/SpecFlow.VS/releases/tag/v2022.1.93-net8

Or switch to reqnroll