wxWidgets is a C++ library
that lets developers create applications for Windows, macOS, Linux and other platforms
with a single code base.
wxWidgets should always be installed from the source code.
Download the source for the latest development version which is 3.1.5.
Follow the installation instructions for your platform.
If you get stuck this forum provides help.
Once you are able to build and run the samples that come with the installation,
you should download a local copy of the docs which are in html format.
You can get development support from these forums.