How to Fix Java Update Error: 1603? 6 Easy & Advanced Solutions

Fix & Repair Solved issue

Question asked by:

Sheona V.


Stumbled Upon Java Error 1603

Just when I thought my Java run was smoothly churning, I tripped over an 'Error 1603'. When I tried updating my Java -- that's the error code I got. Have you run into this error and found a solid workaround?
Thank you!
Fix Java Now iolo's System Mechanic® will automatically fix your Java Error 1603, optimize & protect your whole PC.

To keep your PC’s security up to date and make sure it performs seamlessly, it is important to install Java updates regularly.

[FIXED] Java Error 1603

However, when installing Java1 updates on their Windows PCs, many people encounter Java Error: 1603. It is a known issue that occurs after a while of starting the update process.

But why does it occur? How to fix Java error: 1603? In this guide, we will reveal various ways to fix this Java update error. So read on.

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TL;DR: Quick Ways to Solve the Java Update Error: 1603

  • Restart your PC: Restart your PC and download the offline Java installer on your PC to retry the installation.
  • Check the Version of Java Updates: Make sure you are installing the right version of Java updates for your OS.
  • Disable the Antivirus Program: Disable all the antivirus programs on your PC. 
  • Program Install and Uninstall Troubleshooter: Download and run the Install and Uninstall Troubleshooter from Microsoft’s website.
  • Disable Java Content: Disable Java content from your browser.

Read on to learn more in detail about all of the above-mentioned solutions and more to fix the error.

What Is Java Error: 1603?

Java Error: 1603 is a common Windows error that occurs when Windows users try to install Java updates on their PCs. It is basically a Windows Installer error that indicates that a fatal problem occurred during the Java updates installation. 

It means that “something exists that the installer didn’t expect” or “something the installer expected wasn’t available”. It usually appears like this: “Error Code 1603: Java Update did not complete”

When installing Java updates, everything would run fine but after a few settings, you may run into this error. So what causes Java error 1603? Well, continue reading to find out.

What Causes Error Code 1603: ‘Java Update did not complete’?

There are various reasons why you may run into Java Error: 1603:

  • The Java update has been blocked by an application, web software, or an antivirus program on your PC.
  • You are installing the wrong version of the update for your PC.
  • Java is in use when you start the installation.
  • There is data remaining from an earlier Java installation.

How to Fix Java Error: 1603? 4 Beginner-Friendly Ways (Time to troubleshoot: ~5-15 mins)

If for any reason your Java update has stopped installing, you can try the following fixes.

Method 1: Restart Your PC

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  • When you run into Java Error: 1603, restart the PC.
Restart computer
  • Next, download and install the offline installer on your PC.
  • A prompt box will pop up. Select “Save” and then save the installer package in your desired place.
  • Now start the installation by double-clicking on the installation package.
Download JAVA

Method 2: Ensure You’re Installing the Correct Java Version

Oftentimes, the reason why you may be getting Java Error: 1603 is because you are installing the wrong version of Java updates. You will have to install the right version of the updates according to your operating system.

For instance, for 64-bit Windows, you will need to install a 64-bit version of Java updates. To check which Windows version you have.

  • Go to “Cortana”.
  • Open the search bar and enter “System”.
  • Select the “About your PC” option where you can check the version of the operating system.
Check operating system version

Method 3: Disable Your Antivirus Program (Temporarily)

Oftentimes, your computer’s antivirus program may prevent the Java updates from installing. In fact, it is one of the most common reasons behind the 1603 error. 

So if you run into the Java Error: 1603, try disabling the antivirus program:

  • Open “Task Manager” by pressing ‘Ctrl + Shift + Esc’ keys on your keyboard.
Click Ctrl Shift Esc
  • Now right-click on the Antivirus program.
  • Go to the “Startup tab
  • Select the “Disable” option.
Disable Your Antivirus Program using task manager

Method 4: Launch the Program Install and Uninstall Troubleshooter

  • Go to Microsoft’s website to download the “Program Install and Uninstall Troubleshooter”.
Download Program Install and Uninstall Troubleshooter
  • Now open the “MicrosoftProgram_Install_and_Uninstall.meta.diagcab” file to launch the Troubleshooter program.
  • Select “Next” in the resulting window and then follow the on-screen instructions to troubleshoot the problem.
Launch the Program Install and Uninstall Troubleshooter

How to Fix Java Error: 1603? 2 Advanced Ways (Time to troubleshoot: ~5-10 mins)

If by any chance the above mentioned solutions didn’t work out for you — you can try these advanced ones. However, they’re more tech-savvy.
For most users — iolo System Mechanic fixes the error automatically.

Method 1: Disable Java Content

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Sometimes, disabling Java content in your browser can help you successfully install Java updates.

Here’s how you can disable Java content in your browser:

  • Close the installer window when Java Error: 1603 appears.
  • Now open the “Java Control Panel” on your PC.
  • Now go to the “Security tab”.
  • Uncheck the option that says “Enable Java content in the browser”.
  • Select “Apply” then “OK” to apply and save the changes.
  • Now try reinstalling Java updates. 
  • Once Java updates are installed, enable Java content again by going to the “Java Control Panel > Security” tab and then check the “Enable Java content in the browser “option.

Method 2: Uninstall the Older Versions of Java

If restarting your PC doesn’t work, uninstall all the previous versions of Java that may be named “J2SE”, “Java 2”, “Java SE”, or “Java Runtime Environment”.

Here’s how to install the older versions of Java on Windows 11:

  • Go to the “Start” menu.
  • Select “Settings > System > Apps – Apps & Features”.
  • Now select the previous version of Java that you want to uninstall and then hit the “Uninstall” button.
  • Approve any prompts that may occur to finish the uninstallation.
Uninstall the Older Versions of Java


So that’s all, folks! Running into the Java Error: 1603 can be really frustrating. But now that you know what this error is and what causes it, we hope these fixes help you install Java updates successfully on your PC. 

If by any chance you’re still experiencing some difficulties — try downloading and running an automatic diagnostic and fix software offered below. It’s helped thousands of users like you.

Good luck!

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If your Java Error: 1603 is still not fixed — feel free to reach out to us via email and share your problem.

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About the author
Iggy Shells
Iggy Shells - IT & PC repair expert

Iggy is the founder of He’s been involved in custom IT and security solutions for more than a decade.

Now he and his team are sharing their knowledge with the world by helping casual users solve a myriad of different computer issues, system errors, and virus/malware infections.