Hi,
I had exactly the same problem and error message (CefSharp.Core.dll).
Even if I reinstalled a fresh version of Launchbox in another directory, it would not start anymore
BUT I reinstalled the latest supported Visual C++ redistributable packages for Visual Studio 2015, 2017 and 2019 and everything went back to normal.
https://support.microsoft.com/en-gb/topic/the-latest-supported-visual-c-downloads-2647da03-1eea-4433-9aff-95f26a218cc0
(x86: vc_redist.x86.exe, x64: vc_redist.x64.exe or ARM64: vc_redist.arm64.exe)