If you are on a version of Rogo pre 6.4 you will need to upgrade to that version first. See the releases page for a download link.
Rogō will attempt to install some additional libraries automatically but you may need to install them manually:
cd /path_to_rogo_root_directoryphp composer.phar install--no-dev
cd /path_to_rogo_root_directorynpm install --production
Installing Composer
Go to https://getcomposer.org/download/ or search for composer in your package manager.
Installing NPM
npm comes bundled in nodejs you can download from https://nodejs.org/en/download/ or search for npm/nodejs in your package manager.
After you have upgraded to the latest 6.4 version you will then be able to upgrade to the latest 6.5 See the releases page for a download link.