Alpha access
Play and build with Alpha access.
Need access? Use /alpha apply in any channel on our Discord. Sign in to the launcher with the account you applied with, and the server browser opens up.
Download · OPEN//77 for Windows
Get the launcher
One Windows app: it signs you in, checks your game, installs and updates the mod, and opens the server browser. Free to download; you bring Cyberpunk 2077 2.31 + Phantom Liberty DLC.
Latest launcher
2.31.21+op77.140
Published Oct 13, 2026Download for Windows
Straight from the official OPEN//77 CDN, the only place we publish it.
File details & verification
File: Open77Launcher.exe
SHA-256, published because it costs nothing to publish. If you verify your downloads, this PowerShell line prints the same string. Nothing you have to do.
10c82828be279f0bfd80609b41521ab9804e35d768f1ed9e6434d5cee60a59d0Get-FileHash -Algorithm SHA256 .\Open77Launcher.exeNo account is required for this download. This page is the official source: the build comes straight from the OPEN//77 CDN, and it is the only place we publish it.
- Player platformWindows 10 / 11 · 64-bit
- Game buildCyberpunk 2077 2.31 · exact
- Required expansionPhantom Liberty DLC
- Launcher download63.2 MB
Access & release channels
Free to download. Alpha to play.
Joining a server requires an Alpha-enabled OPEN//77 account; downloading does not grant access. Every Alpha member can also download the dedicated server and start building, without an extra application.
Dedicated server · Windows / Linux · not the launcher
2.31.21+op77.141
Ready-to-play Freeroam and system resources, with the .NET runtime included. No Cyberpunk 2077 installation required on the host. Available to everyone with Alpha access.
Live CDN versions · checked every minute while this page is visible.
The launcher and the dedicated server are separate release channels, so their version numbers differ. The client the launcher installs is versioned with the server build it speaks to.
What it does
Five jobs, one window.
The launcher is the whole player side of OPEN//77. You do not install anything into your game folder by hand, and you do not edit a config to join a server.
Signs you in
One OPEN//77 account, authorized in your browser rather than in the app. The launcher never sees your password.
Checks your game
It makes sure your Cyberpunk 2077 install is build 2.31 with Phantom Liberty DLC before it installs anything. The client is built against that exact version, so you hear about a mismatch up front rather than halfway into a session.
Installs and updates the mod
The OPEN//77 client is fetched, verified and kept current for you. Nothing to unzip into your game folder by hand, and nothing left behind when you turn it off.
Manages what loads
Choose which mods are active for a session. Some servers ask for a clean load-out, so this is how you keep your own setup and still connect.
Finds you a world
Browse community servers, filter them, and press connect. The launcher starts the game already pointed at the world you picked.
First run
What actually happens.
Already installed? Open the launcher, pick a server and press connect. It takes care of the rest.
Windows will show a warning
The launcher is not code-signed yet, so the first launch brings up SmartScreen's “Windows protected your PC” screen. Choose More info, then Run anyway, and you are through. Windows shows that message for every unsigned application, plenty of indie launchers included, and it says nothing about the file itself. The launcher guide spells out exactly what that dialog does and does not mean.
Sign in through your browser
The launcher opens the authorization page on this site. You approve it there, and the launcher receives a token. Your password never goes through the app.
Point it at your game, then play
It locates your Cyberpunk 2077 install, checks the build, installs the client, and opens the server browser. From there it is one button.
Before you install
What you need.
Windows 10 or 11, 64-bit
The launcher is a Windows desktop application, and the client it installs is a native plugin that loads inside the game process. There is no macOS or Linux player build.
Your own copy of Cyberpunk 2077 2.31
Your own legal copy: OPEN//77 never distributes the game or any of its assets. The build has to be 2.31 exactly, not a minimum: the client hooks the engine at addresses established for that build, and the launcher checks it for you.
Phantom Liberty DLC
Required rather than optional: the world you land in when you connect is an EP1 save, so there is nothing to load without it.
Questions
Windows shows a security warning?
Expected: the launcher is not code-signed yet, so SmartScreen flags it like every unsigned application. Choose More info, then Run anyway. Only run the copy you got from this page, and if you want to be sure it is the same file, compare its SHA-256 under “File details & verification” above. The launcher guide explains the dialog in full.
Why are the launcher and server versions different?
They are separate release channels. The Windows button above always serves the current launcher; the server page serves the current dedicated server. Neither substitutes an older build when the other is unavailable.
I want to host, not play.
Hosting is a different download. A dedicated server never needs Cyberpunk 2077 installed and does not use this launcher. Start at Create a Server, then download the server with your Alpha account.
Does downloading give me Alpha access?
No. The download is public; joining a server needs an Alpha-enabled OPEN//77 account. Request access with
/alpha apply in any channel on our Discord, and read the Alpha guide before your first connection.This is Alpha software, not a stable release.
Expect bugs, crashes, incomplete features and updates that change APIs. The Discord is where you can request access with
/alpha apply, report reproducible issues and follow the changelog once you have Alpha access.