Quick Answer

If Lethal Company will not launch on a RTX 5070 Ti, the cause is software, not the card — the game has no anti-cheat and runs comfortably above 100 fps with 16GB of VRAM on this device. Work through it cleanly: verify game files, delete a broken BepInEx mod loader, clear the Steam download cache, and reinstall the NVIDIA driver. That diagnostic path resolves the no-launch and instant-close reports we see from SA players on this device.

Diagnose the no-launch cause

Start by launching vanilla: move any BepInEx folder out of the game directory, because a mismatched mod loader is the top no-launch cause and has nothing to do with the RTX 5070 Ti. Then verify integrity of game files in Steam, and if the game still closes instantly, clear the Steam download cache (Settings, Downloads, Clear Download Cache) and restart Steam. Confirming a clean vanilla launch separates a mod or Steam problem from anything hardware-related on a RTX 5070 Ti.

Driver, Visual C++ and permissions

A missing or corrupt Visual C++ redistributable stops many Unity games from opening, so reinstall the latest x64 redistributable. Then do a clean NVIDIA driver install with DDU. If the game still will not start, right-click the launcher and Run as administrator once, and add an exception in your antivirus — overly aggressive scanning can block the executable. On a RTX 5070 Ti these permission and runtime fixes clear most remaining launch failures.

FAQ

Could my RTX 5070 Ti be the reason Lethal Company won't launch?

No. A no-launch is a software fault — a bad mod loader, missing Visual C++ runtime, corrupt files or a driver issue. The RTX 5070 Ti itself is far more than the game needs and is not the cause.

Does Lethal Company have anti-cheat that blocks launching?

No. Lethal Company ships with no anti-cheat, so an anti-cheat service is never the reason it fails to open. Focus on mods, Steam cache, runtimes and the driver instead.

What if it still won't launch after a clean reinstall on my RTX 5070 Ti?

Check Event Viewer for the APPCRASH module at launch time, reinstall the x64 Visual C++ redistributable, and test a fresh Windows user profile. Those isolate a corrupt profile or runtime on a RTX 5070 Ti.

TIP

without mods, reinstall the latest x64 Visual C++ redistributable, then clean-install the driver with DDU — that order fixes nearly every Lethal Company no-launch on a RTX 5070 Ti.