Uninstall all available that depend on Wx

cpanp -u Wx::ActiveX Wx::DialUpManager Wx::GLCanvas Wx::Metafile Wx::Mozilla Wx::PdfDocument Wx::Polygon Wx::Scintilla Wx::WebKit

Then install the ones Wx::Demo uses

cpanp -i Wx::ActiveX Wx::GLCanvas Wx::PdfDocument