Before You Install

Before you run the Launcher, make sure your system meets the prerequisites below. The install creates a separate modded copy of SCP:SL and does not modify your vanilla Steam install.

Supported platforms

• Windows 10 or newer, 64-bit.
• Linux through Wine or Steam Proton.

macOS is not supported because SCP:SL does not ship a macOS build.

What you need

1. A Steam account that owns SCP: Secret Laboratory.
2. Free disk space for a second copy of the game.
3. A fresh folder for the modded install, separate from your vanilla Steam folder.
4. Network access for the Launcher to download game builds, install resources, MelonLoader, and repository mods.

No local SCP:SL install required

The Launcher can download compatible SCP:SL builds from Steam after you approve sign-in through Steam. You can also use an existing local vanilla directory if you already have the game installed.

What you do not need

• Administrator rights.
• A separate MelonLoader install.
• A C# toolchain unless you are writing mods.
• Manual install resources.

What the install does

The Launcher prepares a modded game folder, applies the compatibility changes Anomaly requires, installs the pinned loader version, verifies required files, and records install metadata so it can reinstall or uninstall later.

Your vanilla Steam-managed install is read as a source only when you choose a local directory. It is not rewritten.

Details are in Install the Modded Client.

Ready?

Proceed to Install the Modded Client.