UT4ever

Step 1: Download stock game files

Step 2: Install the game

a. Unzip UnrealTournament.zip

b. Place unzipped contents in your desired install location

Step 3: Bypass Epic Games Launcher

You have two options here to bypass the Epic Games Launcher (a OR b, don't do both):

a. Install UT4UU (Unofficial Patch) - v10.1.6 *recommended

Click here for UT4UU download link
Unzip and install using included installer: "...\UT4UU-v10_1_2\Installer\UT4UU.Installer.GUI.exe"

b. Create a UT4.exe shortcut and add target parameters to it

Navigate to "C:\Program Files\UnrealTournament\Engine\Binaries\Win64\"
Right-click "UE4-Win64-Shipping.exe" and click Send to -> Desktop (create shortcut)
Go to your desktop, find your shortcut, and Right-click -> Properties
Add the following to the end of the "Target:" line:
UnrealTournament -epicapp=UnrealTournamentDev -epicenv=Prod -EpicPortal
The entire target line should look like:
"C:\Program Files\UnrealTournament\Engine\Binaries\Win64\UE4-Win64-Shipping.exe" UnrealTournament -epicapp=UnrealTournamentDev -epicenv=Prod -EpicPortal

Step 4: Connect to new master server (for online play)

You must connect to the new master server and create an account on it to be able to play UT4 online.

If you have UT4UU installed:

If you do NOT have UT4UU installed:

Troubleshooting

Game startup errors mentioning CorsairRGB means you need to install Visual C++ Redistributable Packages for Visual Studio 2013 - (link here)

Game startup errors mentioning INPUT1_3.dll / DirectX means you need to install Microsoft DirectX End-User Runtime - (link here)

For more troubleshooting, click here