From the Radegast blog:
The current supported method for fetching assets is now supported in 2.28. This is an update you will really want to do. It fixes missing functionality like playing inworld sounds and animations, viewing landmarks. You may also notice a little more “pep” when fetching textures and mesh.So it you need a lightweight viewer capable of most Second Life functions, give Radegast a shot. It's perfect for chatting, running multiple instances as bots or on older systems without the graphics or processing power of new ones. You will need Windows .NET 4.6.2 and it does not yet run natively under Linux or MacOS.
Beside those changes, there are some minor fixes regarding command line arguments, and an OpenTK update. I have more in the works, but wanted to get this change out as soon as possible and as bug free as possible.
Download here: https://radegast.life/downloads/