Enemy Within was locked to a 16:9 ratio with poor scaling. On a 1440p or 4K monitor, the UI becomes microscopic.
Since Firaxis stopped supporting Enemy Within, the modding community took over. If you want a stable "UPD" for 2025, you need the Community Highlander mod.
What is the Highlander UPD?
It is a reverse-engineered, open-source patch that rewrites the core .exe and UPK files. It does not add new content; it fixes what Firaxis broke.
When hardcore fans search for "XCOM Enemy Within UPD," 80% of the time, they mean "How do I update to the latest version of Long War?"
Long War is a total conversion mod so massive it feels like a sequel. The final official version of Long War for Enemy Within is v1.0. It was released in 2016.
However, there have been "UPDs" since then:
How to get the latest Long War UPD:
While there hasn't been a new official content "upd" (update) for XCOM: Enemy Within from developer Firaxis in several years, the game remains highly active in 2026 thanks to critical technical fixes and a massive community-driven overhaul. The "Updating Executable" Fix (January 2025)
Many players on Steam recently encountered a game-breaking "Updating Executable" error. If your game won't launch, use these community-verified solutions:
The Beta Participation Trick: Go to Steam Library > XCOM Properties > Betas. Change "Beta Participation" to linux_initial_release. Launch the game once, then you can switch it back to "None".
Launcher Removal: 2K discontinued their proprietary launcher in late 2024. If you have issues, delete the launcher folders in %localappdata%\T2GP Launcher and %appdata%\T2GP Launcher to force a fresh, clean start.
Launch Options: Adding cmd /c "set OPENSSL_ia32cap=:~0x20000000 && %command%" to your Steam Launch Options has fixed startup crashes for many users on modern CPUs. The Defacto 2025 Update: Long War Rebalance (LWR)
For players looking for a "new" experience, the Long War Rebalance is effectively the living update for the game. As of March 2025, development is still ongoing. Key features of this unofficial update include: xcom enemy within upd
Dynamic Air Game: Interceptors and UFOs now involve non-trivial strategic decisions, and aliens have their own "research progress" that speeds up if they succeed in missions.
SHIV Viability: SHIVs have been updated to act as the heavy-duty weapon platforms they were originally meant to be.
Dynamic Overwatch: Reworked mechanics allow for more aggressive playstyles rather than the slow "overwatch creep" of the base game. Key Features of the Base Expansion
If you are returning after a long hiatus, remember that the Enemy Within expansion (v1.0.x) added the following core content over the original Enemy Unknown:
Meld & Transhumanism: A new strategic resource, Meld, allows you to build a Genetics Lab for soldier augmentations (brain, eyes, skin) or a Cybernetics Lab to create MEC Troopers.
New Threats: Combat the human traitor organization EXALT and new alien units like the Mechtoid and Seeker. Enemy Within was locked to a 16:9 ratio with poor scaling
Base Defense: A critical mission where the aliens invade your XCOM headquarters directly. Compatibility & Mods in 2026
The game remains stable on Windows 10 and 11, though it can be "finicky". For the best experience, visit Nexus Mods for quality-of-life updates like: FIXED* Updating Excecutable Thread 06-Jan-2025 :: XCOM
How to Install the Official Community UPD: You do not need Nexus Mods. The easiest method:
Note: If you see "UPD" in modding forums, it almost always refers to this Highlander update. Without it, XCOM: Enemy Within is borderline unplayable on modern hardware.
Searching "XCOM Enemy Within UPD" often leads to Long War discussions. Long War is a total conversion mod. It has its own update cycle (LW 1.0, 1.1, ... Final is 1.0.1.5).