Instalace ve Windows 10 využitím Ubuntu Linux subsystem:
sudo apt-get install ruby2.1 ruby2.1-dev libssl-dev make g++
sudo rm /usr/bin/ruby /usr/bin/gem /usr/bin/irb /usr/bin/rdoc /usr/bin/erb sudo ln -s /usr/bin/ruby2.1 /usr/bin/ruby sudo ln -s /usr/bin/gem2.1 /usr/bin/gem sudo ln -s /usr/bin/irb2.1 /usr/bin/irb sudo ln -s /usr/bin/rdoc2.1 /usr/bin/rdoc sudo ln -s /usr/bin/erb2.1 /usr/bin/erb sudo gem update --system sudo gem pristine --all
Zdroj: http://blog.costan.us/2014/04/restoring-ruby-20-on-ubuntu-1404.html
sudo gem install vpsfree-client