The latest version of wxMaxima is 19.11.0. All files released so far are available from Github.
apturlwhich means that the wxMaxima version shipped with the current distribution can be installed by simply by clicking this link.
On macOS, the current version of Maxima is now supported by MacPorts, https://www.macports.org/. After installing macports the latest release og Maxima can be installed using the following command:
sudo port install maxima
The development version of Maxima can be installed using the following command instead:
sudo port install maxima-devel
Note: If you have already installed maxima-5.41.0, you must deactivate it with the next command before installing the development version:
sudo port deactivate maxima
wxMaxima can then be installed using the command
sudo port install wxmaxima
sudo port install wxmaxima-devel