The group iNLAWS released Metro Last Light Update v220.127.116.11 incl DLC for the PC platform. I have added the relevant information in the description.
Description: It Is the Year 2034. Beneath the ruins of post-apocalyptic Moscow, in the tunnels of the Metro, the remnants of mankind are besieged by deadly threats from outside – and within. Mutants stalk the catacombs beneath the desolate surface, and hunt amidst the poisoned skies above. But rather than stand united, the station-cities of the Metro are locked in a struggle for the ultimate power, a doomsday device from the military vaults of D6. A civil war is stirring that could wipe humanity from the face of the earth forever. As Artyom, burdened by guilt but driven by hope, you hold the key to our survival – the last light in our darkest hour.
Chronicles Pack DLC:
Revisit the Moscow Metro in these three original missions – play as Anna, Pavel and Khan with Ulman in these gripping side stories to Artyom’s quest. The Chronicles Pack includes three original single-player missions, each from the perspective of a different character from the Metro story. Play as Anna, Pavel, and Khan with Ulman at your side in these gripping side stories to Artyom’s quest.
Developer Pack DLC:
Experience Metro in a whole new way with the Developer Pack! Visit the Shooting Range to test every weapon, and complete challenges. Explore the Museum, and study the Metro’s mutants and characters in maximum detail. Then pit man against beast in the AI Arena. Also included – the Spiders’ Nest. Use light and fire, including your torch, lighter and the new deadly Flamethrower to escape a Spider infested nest in this chilling solo mission.
– Compatibility for The Chronicles Pack DLC