Java 8 update 491 installation error code1603 on Windows 11 Pro

Question

Hi,

I have an error 1603 during installation of last java runtime update (version 8 update 491).

My operating system is Windows 11 PRO 64 bit Version 25H2 Os Build 26200.8246.

Have you some notification regarding this issue from other users? Are there come recommendations to fix?

Answer 1

Hi Sumit,

I've already checked this link but solution proposed doesn't work. Java 8 update 491 was released 2 days ago, I have opened a report to oracle for a possible bug.

Thanks for your support

Stefano

Answer 2

Hi,

when java 8 update 491 installation fails, there is no java installed on my laptop.

No java folder in disc C:\Program Files\ neither java app found under control panel-->pograms; this error seems to disinstall java old version from my laptop

So I have reinstalled Java 8 update 481, without any problems.

But I try to update to last version (491), installation fails and so on.....

Answer 3

I appreciate the reply.

https://www.java.com/en/download/help/error_1603.html

It seems like this is some known issue?

This article applies to:

• Platform(s): Windows
• Java version(s): 8.0

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SYMPTOMS  

Java Update/Install process has not completed and an error appears:

Error Code 1603. Java Update did not complete. Error Code 1603. Java Install did not complete

 

CAUSE  

This error, seen during the installation process, indicates that an installation did not complete. The root cause of this error is under investigation.

Please check the troubleshooting on the page and verify if the error goes away. Otherwise a better idea would be to wait for next update since they have documented this issue.

Standard 3rd party link disclaimer:

There may be links to non-Microsoft websites that provide accurate and safe information. Watch out for ads on websites frequently classified as PUP (Potentially Unwanted Products). There is no need to buy paid products to fix your computers, as they sometimes do more harm than good.

Answer 4

Hi,

There are no widespread issues currently regarding that. Let me suggest some solutions:

Via https://www.reddit.com/r/javahelp/comments/2qx2x8/java_installation_1603_error_have_had_this_issue/

i had the same issue, none of these suggestions worked. What i ended up doing was finding the orphan config file in the program files exact folder location for me was C:\programfiles86\java\jre1.8.0_45\javacpl.exe run this file, and disable java in the browser then i applied closed and tried the installation again and it worked. Hope this helps

Go to start menu then Java folder, click on "Configure Java", click on "Security" tab, uncheck "Enable Java content in browser", now update Java. When you have completed the Java upgrade go back and check "Enable Java content in browser". You should be good to go now.

Also, worth trying removing JRE completely:

https://blog.vilmatech.com/uninstall-java-runtime-environment-jre-completely-with-ease/

I’m eager to hear back and work together to find a solution.

Standard 3rd party link disclaimer:

There may be links to non-Microsoft websites that provide accurate and safe information. Watch out for ads on websites frequently classified as PUP (Potentially Unwanted Products). There is no need to buy paid products to fix your computers, as they sometimes do more harm than good.

Answer 5

Error 1603 is a generic Windows Installer failure. On Windows 11, it typically indicates one of these conditions during MSI-based installs:

1. The application is already installed.
2. The target folder is encrypted.
3. The target drive is accessed as a substitute drive.
4. The SYSTEM account lacks Full Control permissions on the target folder.

To troubleshoot the Java 8u491 installation:

1. Check if Java 8 is already installed
   • Open Start > Settings > System > Apps & features.
   • Look for existing Java 8 installations (for example, “Java 8 Update xxx”).
   • If present, select and Uninstall.
   • Reboot and then run the 8u491 installer again.
2. Install to a non-encrypted folder
   • If installing to a custom path, ensure that folder is not encrypted (no EFS lock icon, and not under an encrypted profile/folder).
   • Try installing to the default location on the system drive (typically under C:\Program Files or C:\Program Files (x86)), ensuring that path is not encrypted.
3. Avoid substitute drives
   • If using a substituted drive (for example created with the subst command), install Java directly to a normal drive letter (such as C:) instead of the substituted path.
4. Ensure SYSTEM has Full Control on the install drive
   • In File Explorer, right-click the drive where Java is being installed (usually C:), select Properties.
   • Go to the Security tab and verify that SYSTEM is listed.
   • If SYSTEM is missing:
     • Click Edit (approve UAC if prompted).
     • Add the SYSTEM account and grant it Full Control.
   • Apply changes and re-run the Java installer.

If the issue persists after these checks, completely uninstall any existing Java versions, reboot, verify permissions on the system drive as above, and then attempt a fresh install.

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References:

• Error 1603 when you try to install a Windows Installer package: A fatal error occurred during installation

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