October 11, 2016
Rise of the Tomb Raider 20 Year Celebration Launches Today
The 20 Year Celebration edition is also available for Windows PC. If you already own the original Rise of the Tomb Raider on PC or Xbox One, you can purchase the new DLC separately or download it as part of the Season Pass. (See the update below for details.) Unfortunately Croft Manor and Co-op Endurance are not availble on Xbox 360.
The developers have also announced that everyone who plays Rise of the Tomb Raider during launch week (October 11-18) on any platform with an online connection will receive 100,000 in-game credits to spend on Expedition Card packs. For more about Expedition Cards and credits, check out the DLC page on my main site. Visit the Square Enix Forums for a general 20 Year Celebration Edtion FAQ. And in case you get stuck, you'll find my detailed Rise of the Tomb Raider walkthrough in the usual place. I'll be adding the new Croft Manor content soon.
If you haven't ordered the game yet, you can find it on Amazon.com, Amazon UK, and at your local game retailer.
UPDATE (8:50 am EDT) - UNLOCKING THE NEW DLC ON PC/XBOX ONE: If you have the game on Steam, the new content should download automatically when you start the game. If that's not happening, right-click the game in the Steam Library list and choose Properties > Updates, then choose one of the options from the drop-down list under 'Automatic Updates'. There's also a tab in the Properties box for DLC. Scroll down and make sure 20 Year Celebration pack is checked.
If the patch has downloaded, you should see version 1.0 build 751.5_64 on the splash screen that comes up when you launch the game.
The actual content doesn't unlock on Seam until 9am PDT. See these patch notes for details.
On Xbox One, if the new content doesn't unlock automatically, go to the Xbox dashboard, choose Store from the menu bar at the top, search for Rise of the Tomb Raider, scroll down to 'Add-ons for this game' then select the Season Pass. Select 'Manage' and you should see a screen with all included DLC. The new stuff should be in the left column under 'Ready to install.' Select that and choose the 'Install all' button. If you then go to 'My Games and Apps' you can watch the download progress.
Once the new content is unlocked, you'll be able to access the Croft Manor DLC from the main menu any time after reaching the Siberian Wilderness level in the main story. Co-op Endurance mode is available under Expeditions > Endurance. Co-op is one of the options in the setup menu.