You can find used physical copies on Amazon or eBay. However, these still require an EA account for activation and may still face issues with missing DLC. 2. The Fan-Led Way: R1 Delta
To play multiplayer on official servers, you must have all three DLC map packs (Expedition, Frontier's Edge, and IMC Rising). Since these were also delisted, it is highly recommended to look specifically for a Titanfall Deluxe Edition or Ultimate Edition key, which includes the season pass. download titanfall 1 for pc link
You can still find unused EA App (Origin) keys on "grey market" sites like G2A or Eneba. Once purchased, you simply redeem the code in the EA App to begin your download. You can find used physical copies on Amazon or eBay
For those who find the official servers too empty or difficult to access, the community created the project. The Fan-Led Way: R1 Delta To play multiplayer