In one of his latest YouTube videos, Manuel Lausmann has been testing the RTL-SDR Blog V4 on SDRuno. SDRuno is the official software for SDRplay RSP devices, however, they provide an ExtIO interface which allows it to be used with an SDR that has an ExtIO driver.

The RTL-SDR Blog V4 recently got an ExtIO driver via hayguen's latest ExtIO release at https://github.com/hayguen/ExtIO_RTL/releases.

In the video Manuel shows how to download and copy over the ExtIO dll, and how to select it in SDRuno. He then goes on to show it in action receiving some HF signals. Note that Manuel's video is narrated in German, but you can use YouTubes auto-caption and auto-translate features to get English subtitles.