Beta 19 is out now to resolve a number of setup issues, and now automatically downloads and installs the Visual C++ 2015 redistributable if needed. This is a release candidate, and I hope to (re-)release 11.3 tomorrow morning.
If you're already on 11.3, you can go ahead and just stay on it, as the only thing that will change for the new 11.3 release is the setup, and if you're already working, then you have no need for it.