Project website along with more specifications can be found from: https://leaguesandbox.github.io/
Project chat on Discord: https://discord.gg/Bz3znAM

Take a look at this

• Install Microsoft Visual Studio 2019 or newer (Community Edition is fine)
• Install latest .NET Framework and Core (VS Installer should let you do that, otherwise check here for Framework, and here for Core)
• Install Editor Guidelines (https://visualstudiogallery.msdn.microsoft.com/da227a0b-0e31-4a11-8f6b-3a149cf2e459)
  • This is strongly encouraged to follow the 120 character limit per line guideline

• Download and run League Sandbox Auto Setup [Source] [Mirror]
• Build and run
• If having trouble, follow the Manual Setup below

• Download the 4.20 version of League game client:
  1. Unscrubbed, packed version: (https://mega.nz/#!hpkiQK5A!pFkZJtxCMQktJf4umplAdPC_Fukt0xgMfO7g3bGp1Io)
  2. Scrubbed, moddable version: (https://drive.google.com/open?id=1vr6kGpDK1Hq3Loh8-2z7dlmXSCGKqY2Z)
• For running the git commands below, Git Bash is recommended
• Clone the git repository using git clone https://github.com/LeagueSandbox/GameServer.git, then to download the necessary contents packages, run:
  • cd GameServer
  • git submodule init
  • git submodule update
• Open the GameServer Solution in VS and Build and run

• Download the 4.20 version of League game client:
  1. Unscrubbed, packed version: (https://mega.nz/#!hpkiQK5A!pFkZJtxCMQktJf4umplAdPC_Fukt0xgMfO7g3bGp1Io)
  2. Scrubbed, moddable version: (https://drive.google.com/open?id=1vr6kGpDK1Hq3Loh8-2z7dlmXSCGKqY2Z)
• Install git and dotnet (dotnet-host, dotnet-runtime, dotnet-sdk, dotnet-targeting-pack) using your distro's package manager
• Clone the git repository using git clone https://github.com/LeagueSandbox/GameServer.git, then to download the necessary contents packages, run:
  • cd GameServer
  • git submodule init
  • git submodule update
• Build the server by running dotnet build .
• Enter the output directory by running cd GameServerConsole/bin/Debug/netcoreapp3.0/
• Open Settings/GameServerSettings.json and change "autoStartClient": true to false
• Start the server: ./GameServerConsole

Click the debug button.

Auto run settings are located in GameServer/GameServerConsole/bin/Debug/netcoreapp3.0/Settings/GameServerSettings.json, there is where you'll set the path to your League of Legends' deploy folder, which shown by the example already in the file.

start "" "Path/To/Your/League420/RADS/solutions/lol_game_client_sln/releases/0.0.1.68/deploy/League of Legends.exe" "8394" "LoLLauncher.exe" "" "127.0.0.1 5119 17BLOhi6KZsTtldTsizvHg== 1"

• Install wine and winetricks using your package manager.
• Run winetricks d3dx9 - without this you will get into the game, but your screen will be black.
• Mark .exe files executable by running find . -type f -iname "*.exe" -exec chmod +x {} \; in your League-of-Legends-4-20 directory.
• Enter the directory containing the client by running cd /path/to/your/League-of-Legends-4-20/RADS/solutions/lol_game_client_sln/releases/0.0.1.68/deploy/
• Run the game:

./League\ of\ Legends.exe "8394" "/path/to/your/League-of-Legends-4-20/RADS/projects/lol_launcher/releases/0.0.0.227/deploy/LoLLauncher.exe" "" "127.0.0.1 5119 17BLOhi6KZsTtldTsizvHg== 1"

This repository is under the AGPL-3.0 license. This essentially means that all changes that are made on top of this repository are required to be made public, regardless of where the code is being ran.