$ wget https://github.com/OpenVPN/easy-rsa/releases/download/v3.0.7/EasyRSA-3.0.7.tgz
$ tar xvf EasyRSA-3.0.7.tgz
$ sudo mv EasyRSA-3.0.7 /opt
$ sudo chown -R root:root /opt/EasyRSA-3.0.7
$ export PATH=/opt/EasyRSA-3.0.7:$PATH