1635 This patch package could not be opened. Verify that the patch package exists and that you can access it.

Hi,

1. Did you make any changes on the computer prior to the issue?
2. Is the issue confined to Adobe reader?

Method 1:

You may try the steps from the link and check.

Error Message: 1635 This Patch Package Could Not Be Opened

http://support.microsoft.com/kb/812490

Note: This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry in Windows:

http://support.microsoft.com/kb/322756

Method 2:

Follow the steps from the link and check:

Error "1635: This patch package could not be opened

http://helpx.adobe.com/acrobat/kb/error-1635-patch-package-not.html

Note: This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry in Windows:

http://support.microsoft.com/kb/322756

Method 3:

If the above steps doesn't help then you may try the steps from the links and check.

Troubleshoot Adobe Reader installation | Windows

http://helpx.adobe.com/acrobat/kb/troubleshoot-reader-installation-windows.html

Update errors | Acrobat, Reader | Windows

http://helpx.adobe.com/acrobat/kb/update-errors-acrobat-reader-windows.html

If the issue still persists then you may post the query in the Adobe Support for further assistance:

http://helpx.adobe.com/contact/

​Hi,

Method 1:

Run the fix it and check.

http://support.microsoft.com/mats/windows\_update/

Method 2:

Put the computer in clean boot state before proceeding with the installation of windows update.

How to configure Windows XP to start in a "clean boot" state

http://support.microsoft.com/kb/310353

Note: When the troubleshooting is over do not forget to reset the computer to normal startup. Follow the step 7 in the above article.

Hello,

I've tried the Microsoft Fix it, but it didn't help.

I've also tried to unsinstall Acrobat 9 Pro, but there was also a problem: "windows installer" Impossible to access this package. Please verify that it exists or allowed to access to it. Or verify that this package of windows installer is valid.

Thanks.

Vincent

​Hi,

You may run the Microsoft Fix it and check.

How to fix MSI software update registration corruption issues

http://support.microsoft.com/kb/971187/en

Note: This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry in Windows:

http://support.microsoft.com/kb/322756

Hi,

I don't have those keys of method 1 and 2 on my computer. I don't have plus or acrobat reader installed.

I have already tried the second step of method 3, but will post the query in the adobe support.

Meanwhile, if someone has any idea's...

Thanks.

Vincent