Trending Hacks To Resolve Adobe Error 1321

Users encounter Adobe error 1321 when they attempt to use either the CS4 or CS5 products from the application during the trial period. It can arise if the installer has insufficient privileges.

This situation is triggered due to incorrect settings and damaged system files that restrict users from installing necessary programs. Usually, this Adobe error code comes up with a notification that signifies “Error 1321 occurs: The Installer has insufficient privileges to modify this file C:\Windows\system32\Macromed\Flash\FlashPlayerTrust\AcrobatConnect.cfg”. 

Certain factors influence this error, which we will discuss in this post. Here, it will assist you on how to overcome the Adobe error.

Causes Behind “Adobe Reader Update Failed Error 1321” Message

There can be various leading causes behind this Adobe Reader 1321 error. Among them, corrupted or missing system files and issues in the Windows registry can influence this Adobe error. 

Furthermore, the presence of malware or virus can also be responsible for the issue. Improper installation of the Adobe software can also lead to the Adobe error 1321.

Moreover, if you have third-party security software installed on your device, you can get this error. As the security suite can conflict with the Adobe software and prevent it from working properly. 

Adobe Error 1321: Few Potential Measures to Resolve It

After identifying the major causes, now, it’s time to troubleshoot the Adobe error 1321. To do so, you can focus on the below section.

Procedure 1: Update the Software

Before moving towards the critical methods, we suggest you update the software. In most cases, after updating the software, the Adobe error has been resolved. This process will also enhance system performance and help you to resolve the error.

  • Tap on the Start menu and then hit the Gear icon to invoke the Settings app.
  • In the Settings app, choose the “Update and Security” icon.
  • After that, select “Windows Update” from the sidebar and tap on the “Check for Updates” option.
  • To update the newest version, hit the “Install Update” button. 

Once the download process is finished, install the update to your device by following the on-screen prompts. When the entire process is over, reboot your device to let the new changes take effect.

Procedure 2: Alter the Settings of the Flash

After updating the software, if Adobe error 1321 still appears, you might require to alter the settings of the flash. We hope that after altering the flash, you will be able to resolve the Adobe error.

To try this procedure, follow the underlying steps accordingly.

Step 1: 

Firstly, initiate the Windows Explorer from the Taskbar and enter the following into the search dialog box. 


After entering the address, do not forget to hit the Ok button. 

Step 2: 

From the result-oriented window, try to find the “FlashPlayerTrust” folder. Once you find it, proceed to right-click on it and choose its Properties from the appeared menu.

But, if you do not find the folder of FlashPlayerTrust, you need to navigate to the “View Tab”. Then, hit the “Show/hide” button to launch the window.

Step 3: 

Under the “Show/hide” section, place a tick mark to the “Hidden Items” checkbox to select it. Now, navigate to the “FlashPlayerTrust Properties” and proceed to the “Security” tab. Under this tab, choose the “Group Or User Names” from the appeared menu.

Step 4: 

Afterward, go to the “Permissions” list and reset the option of Full Control as “Allow”. Now, make the necessary changes on the “Group Or User Names” and go to the “Advanced Option” that is present under the Security tab.

Step 5: 

In the next step, locate and choose the “Replace Permission Entries On All Child Objects With Entries Shown Here That Apply To Child Objects” option. Hit the OK button to proceed further.

Step 7: 

Here, you will find the security dialog box. In this box, press the “Yes” button to continue the process. Once you are done with all the instructions, hit the OK button to close the “FlashPlayerTrust Properties” window.

After completing the altering process, reboot your device to apply the recent modifications. Now, verify whether the Adobe error code 1321 persists or not.

Procedure 3: Update the User Insufficient Privileges to Files

Sometimes, Adobe Reader update failed error 1321 can also be triggered if you do not have essential permissions over the installation directory. This can be quite a necessary procedure that you should try to resolve the Adobe error. 

To update the user insufficient privileges in files, try to find the installation directory that is giving you trouble. Once you find it, right-click on it and select the “Properties”. Here, you may have to reset the security permissions to overcome the Adobe error 1321.  

Thereafter, navigate to the “Security” tab and hit the “Exit” button. Afterward, go to the “Group or user names” section and choose “Everyone or SYSTEM” from the context menu. Next, make sure that the ‘Full Control” is selected in the “Allow” column.

Further, inside the “Users or Groups” window,  choose “Everyone or SYSTEM” and hit the “Check Names” option from the menu. After implementing this instruction, the “SYSTEM or Everyone” group will be added. Again, choose the “Full Control” into the “Allow” column and hit the Apply button as well as the OK button to save the new changes.

Procedure 4: Disable the Security Suite

As we already mentioned that third-party security software creates conflict within your device and interfere with the Adobe software. So, to prevent such occasions, you need to disable the Security suite. Therefore, carry out the undermentioned steps to perform the task.

  • Go to the Start menu and open the Settings app. Once the Settings window invokes, click on the “Update and Security” option to open the experience.
  • Inside the “Update and Security” section, locate and select the “Windows Security”.
  • Next, navigate to the “Virus and Threat Protection” and open the “Manage Settings” window.
  • Inside the “Manage Settings” window, locate and select the “Real-Time Protection” button and switch the option to ‘Off’.
  • After that, you have to mention the timing to resume the “Real-Time Protection”.
  • Now, hit the OK button twice from the dialog box to apply the recent modifications.

Procedure 5: Update the Adobe Software

If you are using an outdated version of Adobe software, you might confront the Adobe error due to this reason. On such occasions, updating the Adobe might give you the desired result. Hence, you can update the Adobe software by following the underlying steps.

  • Open the Adobe Reader or Acrobat application.
  • Select “Help” from the appeared menu.
  • Then, choose “Check for Updates” from the pop-up menu.

After that, follow the on-screen instruction for further help. We hope, after updating the Adobe software you will be able to resolve the trouble.

But, in case, updating fails to fix error 1321, we recommend you to uninstall the software from your device and then install a fresh copy.


In this post, we have provided all the necessary information regarding Adobe error 1321. After implementing the above methods, hopefully, you will be able to overcome the error. In case, the Adobe error still bothers you, you can clear out the Registry that might be responsible for the Adobe error. For this purpose, you can install any trustworthy registry cleaner.

You can share your feedback on the solutions provided in this article to encourage our technical team. We assure to post more articles on Adobe issues along with the fixes.

Maria Colombo
Maria Colombo
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