Please note that the vim-colorscheme-switcher plug-in requires my vim-misc plug-in which is separately distributed.
Unzip the most recent ZIP archives of the [vim-colorscheme-switcher] dcs and [vim-misc] dms plug-ins inside your Vim profile directory (usually this is ~/.vim on UNIX and %USERPROFILE%\vimfiles on Windows), restart Vim and execute the command :helptags ~/.vim/doc (use :helptags ~\vimfiles\doc instead on Windows). Now try it out: Execute :NextColorScheme to switch to the next color scheme.
If you didn't change the plug-in's configuration you can now use the F8 and Shift-F8 keys to switch to the next/previous color scheme.
If you prefer you can also use Pathogen pathogen, Vundle vundle or a similar tool to install & update the [vim-colorscheme-switcher] github-colorscheme-switcher and [vim-misc] github-misc plug-ins using a local clone of the git repository.