Download Windows installer. Run the installer, Windows Smart Screen warning will probably appear:

warning01

Click "More info" link:

warning02

Click "Run anyway" button:

setup_1

Click "Next" button:

setup_2

Click "Next" button:

setup_3

Click "Install" button:

setup_4

Click "Finish" button. Look for the following icon on your desktop:

icon

The reason Windows Smart Screen window appears, is that the installer is not signed using the expensive EV certificate, only the cheaper SV certificate. Once enough reputation will be built for the certificate on Microsoft's servers, it should go away. Reputation is increased by people clicking the "Run anyway" button.

Download Mac installer. Run the installer:

mac_setup_1

Click "Continue" button:

mac_setup_2

Click "Continue" button:

mac_setup_3

Click "Install" button:

mac_setup_4

Enter your password, and click "Install Software" button:

mac_setup_5

Click "Close" button. Look for the following icon in Launchpad:

launchpad

wget https://ml.derwinski.pl/update/mlotro_1.0.4-1_amd64.deb
sudo dpkg -i mlotro_1.0.4-1_amd64.deb

Download deb package. Doubleclick the file to open package installer:

deb_setup_1

Click "Install Package" button:

deb_setup_2

Enter your password when prompted for. Close package installer window. Look for the following icon in Games menu:

linux_menu

wget https://ml.derwinski.pl/update/mlotro-1.0.4-1.x86_64.rpm
rpm -U mlotro-1.0.4-1.x86_64.rpm

Download rpm package. Doubleclick the file to open package installer:

rpm_setup_1

Click "Install" button:

rpm_setup_2

Enter your password when prompted for. Close package installer window. Look for the following icon in Activities - All menu:

icon_centos

In case of font problems, see here.

sudo apt-get install libfreetype6 fontconfig fonts-dejavu

sudo yum install freetype fontconfig dejavu-sans-fonts