You can use the Auto Config option in the Advanced Options menu to have the game determine what settings are best for your PC. Your video card memory will be displayed in the bottom-right of this menu and it is recommended that you not exceed a Texture setting higher than what is suggested for your video card. You can check the texture section of the Advanced Graphics options menu in-game to review what the recommended hardware is for each Texture setting.
Once the download has completed, you will be able to use Ultra Textures in-game (note that these textures require a fairly powerful PC). From here you can see the HD content DLC listed and you can check the 'install' box to start the download. It also brings in more heroes, spells and units for the original factions of the game which are Mordor. Select properties and click on the DLC tab. The mod brings in a new evil faction in its entirety.
If a download does not start, go back to your Game Library and right-click 'Middle-Earth: Shadow of Mordor' in the game list. You will see 'Middle-earth: Shadow of Mordor - HD Content' listed here as a free download and you can click 'Install game' to start the download for this.
On the right under the 'Links' section, click the DLC link. To do this, open your Games Library in Steam, find 'Middle-Earth: Shadow of Mordor' in the game list, and select it. To use Ultra Textures, you must first download the free Ultra Texture DLC.
