Runelite encountered a fatal error while downloading the bootstrap

In the world of gaming, few experiences are as frustrating as a software glitch. If you’re anything like me, you’re probably familiar with the disheartening feeling when an eagerly anticipated gaming session is interrupted by a jarring error message. Imagine this: you’ve made yourself a cozy little nest on the couch, grabbed your favorite energy drink, and settled down to get lost in the world of your favorite MMORPG. The game in question is Old School RuneScape, and you’re using the ever-popular RuneLite client to enhance your gameplay. However, just as you’re about to launch into the heart of the game, a chilling notification pops up on your screen: “RuneLite encountered a fatal error while downloading the bootstrap.”

The joyous atmosphere suddenly freezes and it feels as if the air has been sucked out of the room. Suddenly, your adventure has come to an unexpected halt. Such an encounter is certainly not part of the ideal gaming experience. Fear not, though, because this is a problem that can be solved. No matter how daunting or complex the error message may seem, the solution is often simpler than you’d think. So, hang tight, fellow adventurers, because here are the steps to embark upon to conquer this digital beast.

Runelite encountered a fatal error while downloading the bootstrap

Also read: Openssl: error:0a00018e:ssl routines::ca md too weak

Why Runelite encountered a fatal error while downloading the bootstrap?

Outdated Client Version

One of the most common issues that may lead to the fatal error is running an outdated RuneLite client version. When developers release an update, it usually contains essential patches for bugs or glitches that were present in the previous versions. Neglecting to keep the client up-to-date might result in problems such as the “RuneLite encountered a fatal error while downloading the bootstrap” error message. Make it a habit to check for updates on a regular basis.

Faulty Internet Connection

A faulty internet connection can be another culprit behind this issue. RuneLite relies heavily on a stable network connection for downloading the bootstrap and operating without interruption. If your network is unstable or slow, it may interrupt the download process and lead to the fatal error. Regularly checking your network’s speed and stability can save you from such problems.

Firewall or Antivirus Interference

Your firewall or antivirus software can sometimes interfere with RuneLite’s operations, hindering the download process of the bootstrap. These protective softwares are designed to guard your system against potential threats, but sometimes they can get a bit overzealous and block or interrupt the operations of safe applications like RuneLite. Hence, consider checking your firewall and antivirus settings to ensure they are not causing the issue.

Inadequate System Requirements

RuneLite, like any other software, requires a certain level of system specifications to run properly. If your device fails to meet these requirements, you may face issues like the fatal error during bootstrap download. It’s always wise to ensure your device’s specifications align with the minimum system requirements mentioned by RuneLite.

Corrupted Installation Files

Sometimes, the cause of a “RuneLite encountered a fatal error while downloading the bootstrap” error message could be as simple as corrupted installation files. These can occur due to various reasons such as system crashes, incomplete downloads, or even power outages during installation. In such cases, reinstalling RuneLite can often solve the problem by replacing the corrupted files with new ones.

Conflicts with Other Applications

Some applications running on your system might interfere with RuneLite, resulting in the fatal error. If you have recently installed new software or updated existing ones, these could be clashing with RuneLite’s processes. Identifying and resolving these software conflicts can often eliminate the error message.

Issues with Java Runtime Environment

As RuneLite operates on the Java platform, it requires a well-functioning Java Runtime Environment (JRE) on your system. If your JRE is outdated or not working properly, you might encounter various errors, including the bootstrap download failure. Regularly updating your Java Runtime Environment can help avoid such complications.

Lack of Administrator Permissions

Finally, it’s possible that RuneLite doesn’t have the necessary permissions to download and install the bootstrap files. This is particularly probable if you’re using a shared or workplace computer where access rights are controlled. Checking and adjusting administrator permissions could rectify the issue.

How to fix when Runelite encountered a fatal error while downloading the bootstrap

Fix 1. Enabling RuneLite in Firewall Settings

  1. Open the Control Panel on your computer.
  2. Navigate to System and Security.
  3. Click on Windows Defender Firewall.
  4. On the left pane, select Allow an app or feature through Windows Defender Firewall.
  5. Click on Change Settings, then Allow another app.
  6. Browse for RuneLite, select it, and click Add.
  7. Ensure both Private and Public boxes are checked for RuneLite. Click OK to save changes.

Fix 2. Using a VPN for Stable Connection

  1. Choose a reputable VPN provider.
  2. Download and install the VPN software on your device.
  3. Launch the VPN and connect to a server.
  4. Try downloading the RuneLite bootstrap again.

Fix 3. Resolving Software Conflicts

  1. Try to recall any new software or updates you’ve installed recently.
  2. Disable these temporarily and check if the error persists.
  3. If the error disappears, you’ve identified the problematic application. Reach out to the software provider’s customer support for further assistance.

Fix 4. Requesting Administrator Privileges

  1. Locate the RuneLite installer on your device.
  2. Right-click on the installer and select “Run as administrator”.
  3. Follow the prompts to install RuneLite with administrative permissions.

Fix 5. Running RuneLite as an Administrator

  1. Navigate to the folder where the RuneLite application is installed on your computer.
  2. Once you’ve found the RuneLite icon, right-click on it.
  3. A drop-down menu will appear. Select the option that says “Run as administrator”.
  4. If a dialogue box appears asking for permission, select “Yes”.

Fix 6. Checking Your Disk Space

  1. On your desktop or in the file explorer, open “This PC” or “My Computer”.
  2. You’ll see different drives listed, such as the C: or D: drives.
  3. Under each drive, you’ll see a bar showing the used and free space.
  4. If the bar under the drive where RuneLite is installed is red or nearly full, you may need to clear some space.
  5. Delete unnecessary files or uninstall applications you no longer use to free up space.

Fix 7. Disabling Your Antivirus Temporarily

  1. In the taskbar at the bottom right of your screen, you should see an icon representing your antivirus application.
  2. Right-click this icon to bring up a menu.
  3. This menu should have a “disable” or “turn off” option. Note: The exact wording may vary depending on your antivirus software.
  4. Click this option. Remember to turn it back on as soon as you’ve finished checking RuneLite, to keep your computer protected.

Fix 8. Checking for OS Updates

  1. Go to your start menu and select “Settings”.
  2. In the settings window, look for an option that says “Update & Security”.
  3. Select this option. If there are any pending updates, it will be indicated here.
  4. Install any available updates, and restart your computer if prompted.

Fix 9. Using a Different Network

  1. If you are connected to a WiFi network, try switching to a different one. If another WiFi network isn’t available, consider using a mobile hotspot.
  2. Once connected to the new network, attempt to download the RuneLite bootstrap again.
  3. If the issue resolves, the problem is likely with your initial network.

Fix 10. Checking RuneLite Server Status

  1. Open your internet browser and navigate to the official RuneLite website or their social media pages.
  2. Look for any recent announcements or news updates that mention server downtime or maintenance.
  3. If there’s ongoing server maintenance or a reported outage, you’ll have to wait until the server is back online before trying again.

Fix 11. Verifying Game Cache Integrity

  1. Open your game library (like Steam) where RuneLite is installed.
  2. Locate RuneLite in your library, right-click on it, and select “Properties”.
  3. A new window will appear. Navigate to the “Local Files” tab.
  4. Click on the “Verify Integrity of Game Files” button and wait for the process to complete.

Fix 12. Performing a Clean Reinstallation

  1. Uninstall RuneLite completely from your system, ensuring that all associated files are removed.
  2. Restart your computer.
  3. Download the latest RuneLite version from the official website and install it anew.

Fix 13. Updating Java Runtime Environment

  1. Visit the official Java website.
  2. Download the latest version of JRE.
  3. Install the newly downloaded Java Runtime Environment.
  4. Restart your computer and try downloading the RuneLite bootstrap again.

Fix 14. Resetting Network Settings

  1. Press the Windows key + X on your keyboard to open the Power User menu, and then click “Command Prompt (Admin)”.
  2. In the command prompt, type “netsh winsock reset” and hit the enter key.
  3. Once the command has been successfully executed, close the command prompt and restart your computer.


The “RuneLite encountered a fatal error while downloading the bootstrap” issue can be daunting but is far from insurmountable. Varied in origins, it might spring from outdated Java, network issues, disk space shortages, or even administrative restrictions. But fear not! Numerous solutions exist, including running RuneLite as an administrator, updating your Java, or performing a clean reinstallation. Remember, when tackling tech problems, patience and persistence reign supreme. And while it might seem an uphill task, your passion for gaming will carry you through these stormy seas to the tranquil waters of smooth gameplay. Happy gaming!


Q1: Why am I getting a “RuneLite encountered a fatal error while downloading the bootstrap” error message?

A1: This error can occur due to numerous reasons, such as outdated Java, insufficient disk space, network issues, or software conflicts.

Q2: What’s the first step I should take when seeing this error?

A2: Start by ensuring your Java Runtime Environment is up-to-date, as RuneLite operates on the Java platform.

Q3: My Java is updated, but I still encounter the error. What next?

A3: If updating Java didn’t help, try running RuneLite as an administrator or check your disk space.

Q4: Could other applications interfere with RuneLite?

A4: Yes, some applications might conflict with RuneLite. Disabling these temporarily can help identify the issue.

Q5: What should I do if nothing works?

A5: If all else fails, try a clean reinstall of RuneLite, or consider reaching out to RuneLite’s support for assistance.