Unreal Engine usually takes 30 minutes to 2 hours to install, depending on your internet speed and which components you choose
The installation time depends on three things: how fast your internet connection is, how much storage space you have available, and which engine version and optional features you select during setup. A full Unreal Engine 5 installation on a fast home connection (100+ Mbps) typically finishes in under an hour. On slower connections (10–25 Mbps), expect 2 to 4 hours. The actual read size is roughly 130 GB for the complete engine with all optional content, though you can reduce this by skipping sample projects and marketplace content during installation.
The installer also needs to compile some components after downloading them, which adds 10 to 30 minutes depending on your CPU speed. This happens in the background while the read continues, so you do not have to wait for the read to finish before compilation starts.
Key Takeaways
- A typical Unreal Engine 5 installation takes 30 minutes to 2 hours on a standard home internet connection, with most finishing in under an hour.
- Slower internet (under 25 Mbps) can extend installation to 4 hours or more, while faster connections (100+ Mbps) may finish in 30 to 45 minutes.
- You can speed up installation by unchecking optional sample projects and marketplace content during the setup wizard, reducing the read size by 20 to 30 GB.
- The installer compiles engine components while downloading, so you do not need to wait for the full read before compilation begins.
- Pausing and resuming the installation is safe and will not corrupt the read, though resuming may take a few seconds to verify what has already been downloaded.
What Affects Installation Speed Most
Your internet connection speed is the largest factor. If you have a 500 Mbps fiber connection, the read portion finishes in 15 to 20 minutes. If you have a 5 Mbps connection (common in rural areas), expect 6 to 8 hours just for the read. Most people with standard cable or fiber internet (50–200 Mbps) see downloads complete in 20 to 45 minutes.
Your hard drive speed matters less than internet speed, but it still counts. An SSD (solid-state drive) writes data faster than a traditional spinning hard drive, so the installer can write files to disk more quickly while still downloading. This difference is usually 5 to 10 minutes across the whole installation. If you are installing to an external USB drive or a network drive, expect the installation to take 50 percent longer or more.
Your CPU speed affects compilation time. Modern processors (Intel Core i5 or newer, AMD Ryzen 5 or newer) compile the engine components in 10 to 20 minutes. Older or slower processors may take 30 to 45 minutes for this step. This happens after the read, so you cannot skip it.
How to Reduce Installation Time
The Epic Games Launcher lets you uncheck optional content before installation starts. In the installation options, you can disable sample projects (which saves about 20 GB), marketplace content, and documentation. If you only need the engine itself and the source code, unchecking these items cuts the read size roughly in half and saves 30 to 60 minutes of installation time.
Close other programs that use your internet connection while installing. Streaming video, downloading files, or running cloud backups will slow the engine read noticeably. Pausing these tasks for the duration of the installation is the fastest approach.
If your internet is unstable or very slow, consider installing on a different machine with faster internet and then transferring the installation folder to your main computer via external drive. This is practical only if you have access to another computer and an external SSD with at least 200 GB of free space, but it can save hours on very slow connections.
What Happens During Installation
The Epic Games Launcher downloads the engine files in chunks and writes them to your hard drive as they arrive. At the same time, it begins compiling certain engine components — this is why you see the progress bar continue moving even after the read percentage reaches 100 percent. The launcher is extracting and preparing files for use.
Once compilation finishes, the launcher runs a final verification to may support all files downloaded correctly. This usually takes 2 to 5 minutes. After verification completes, the engine is ready to use, and you can launch it when ready.
Pausing and Resuming Installation
You can pause the installation at any time without damaging it. The launcher saves your progress, and when you resume, it picks up where it left off. Resuming may take a few seconds while the launcher verifies which files have already been downloaded, but this is normal and does not mean the installation is starting over.
If your computer loses power or internet during installation, the launcher will resume automatically when you restart it, as long as you do not delete the installation folder. The launcher stores temporary files in the same location as the final installation, so moving or deleting the folder will force a complete restart.
Checking Installation Progress
The Epic Games Launcher shows read speed in megabytes per second (MB/s) and an estimated time remaining. This estimate updates as your connection speed changes. If the estimate seems wrong, it is usually because your internet speed is fluctuating — this is normal on most home connections, especially if other devices are using the network.
You can see the actual installation folder size growing in real time by opening your file manager and navigating to the engine installation location (usually C:\Program Files\Epic Games\UE_5.X on Windows or /Users/[YourName]/Epic Games/UE_5.X on Mac). The folder will grow from 0 to roughly 130 GB as the installation progresses.
Troubleshooting Slow or Stuck Installations
If the installation appears stuck (the progress bar has not moved in 10 minutes), check your internet connection by opening a web browser and loading a website. If the web page loads normally, your internet is working, and the launcher may just be compiling in the background. Wait another 10 minutes before taking action.
If your internet is actually down, pause the installation and resume it once your connection is back. If the launcher shows an error message, restart the Epic Games Launcher completely. Right-click the launcher in your system tray (Windows) or menu bar (Mac) and select "Quit", then reopen it. The launcher will resume the installation automatically.
If the installation fails repeatedly at the same point, your hard drive may be full. Check that you have at least 200 GB of free space available. If you do not, move files to an external drive or delete programs you no longer use, then restart the installation.
Frequently Asked Questions
Can I use my computer while Unreal Engine is installing?
Yes, but your computer will be slower. The installer uses a significant portion of your internet bandwidth and CPU resources. Web browsing and light tasks work fine, but gaming, video editing, or other demanding programs will be noticeably sluggish. Closing these programs speeds up the installation.
Do I need to keep the Epic Games Launcher open while installing?
Yes. The launcher manages the entire installation process. If you close it, the installation pauses. You can minimize it to the system tray, but closing the window completely stops the installation until you reopen the launcher.
What if my installation fails partway through?
Restart the Epic Games Launcher. It will verify the files already downloaded and resume from that point. If the same error occurs repeatedly, try uninstalling and starting fresh. The launcher has a "Verify" option in the engine settings that checks for corrupted files without re-downloading everything.
Can I install Unreal Engine on an external drive?
Yes, but installation will be slower because external drives have slower write speeds than internal drives. USB 3.0 or 3.1 external SSDs are much faster than USB 2.0 or traditional external hard drives. Installation to an external SSD may add 30 to 60 minutes compared to an internal SSD.
Why does the installation show 100 percent read but still say it is installing?
The launcher is extracting and compiling engine components. The read is complete, but the engine files need to be prepared for use. This step typically takes 10 to 30 minutes and happens automatically. You do not need to do anything — just wait for the progress bar to finish.