# Adobe Patch Installation Failure - Error Code 1625

**Last Updated On**: 10 Aug 2026  
**3 minutes read**

With the help of the following steps, you can install patches of Adobe applications.

## Problem

You're trying to install the patches for Adobe applications and the installation fails with an error message: "Error 1625: This installation is forbidden by system policy."

## Cause

This might be due to any of the following reasons:

- You aren't logged in as an administrator.
- Your Windows Installer system policy prevents you from installing digitally-signed software updates.

## Resolution

Follow the steps given below to resolve this issue:

1. Log in to your computer with administrative rights, and then install the application.
2. If the above resolution doesn't work, you should enable installation of digitally-signed software updates:

   ### If you're using Windows 7, 8 or Vista follow the steps given below:

   - Open the Run window by pressing Windows key + R → type `gpedit.msc` → click OK.
   - Navigate to Local Computer Policy → Computer Configuration → Administrative Templates → Windows Components → Windows Installer.
   - Double-click on **Prohibit non-administrators from applying vendor-signed updates** → click **Disabled** → click **OK**.

   ### If you're using Windows XP follow the steps given below:

   - Open the Run window by clicking on Start on the Windows taskbar.
   - On the Run window, type `gpedit.msc` → click OK.
   - On the Group Policy Window, navigate to Local Computer Policy → Computer Configurations → Administrative Templates → Windows Components → Windows Installer.
   - Double-click **Prohibit Non-Administrators from applying vendor signed updates**.
   - Click **Disabled** → Click **OK**.

   If the above mentioned steps don't solve the issue, try restarting the machine.

3. If you're using a Windows Server machine and the above mentioned steps don't work, try changing the registry values and restarting the system.

   For further clarity on the issue visit the [link](https://forums.adobe.com/thread/1494922).

4. If the issue persists even after following the above-mentioned resolutions, please feel free to contact [patchmanagerplus-support@manageengine.com](mailto:patchmanagerplus-support@manageengine.com).