Fix It Fast: Access Denied to Installation Source Error Code 30015-4 (5)!

Encountering the error message- “Access denied to installation source: Sorry, we ran into a problem accessing a required file… Error Code 30015-4 (5)” can be annoying, especially when you are installing critical software or updates. This error specifies that there is a problem with accessing the source files essential for installation. (Here is the complete error along with the screenshot).

Access Denied To Installation Source

In this post, we will explore the root causes and other vital info including the troubleshooting ways to solve error code 30015 office 2019/2016 efficiently. Read further to know more in detail…

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Quick Fixes:

What Is Error 30015 4 On Office Install?

The 30015-4 Office error generates when you try to install the latest version of MS Office on your Windows system. When this error occurs, it simply means that the Office installation process fails due to either a fault in the installation source or directory.

However, this error is caused due to various factors, such as:

  1. Active Proxy Server or VPN.
  2. Due to antivirus or third-party Firewall interference.
  3. Office installation gets corrupted.

Now, it’s time to tackle the situation by applying the solution discussed in the next section.

How to Fix Access Denied to Installation Source- Error Code: 30015-4 (5)?

Here are the quick ways to troubleshoot this error. But before applying them restart your PC to check for the error.

Method 1- Uninstall Previous Installations of Office

You can try to remove the previous office installation along with its traces to fix it. Check out the below article to know how you can do so.

Uninstall Office without leaving traces using Microsoft Fixit

Method 2- Deleting 3rd-Party Software

Another method that you should try to get rid of this error message is to remove the 3rd party software, particularly the security suite that you’ve installed on your computer.

Follow these steps to do this:

  • First, press Win + R together to open the RUN dialogue box.
  • There, type msconfig command.

Access Denied to Installation Source

  • Then, click on Services tab >> choose Hide all Microsoft services.
  • After that, click on Disable All to disable the remaining services.

Access Denied to Installation Source

  • Now, restart & try to reinstall them.
  • At this time, check permissions on the installation folder. To do so, go to the below path >> click on the Microsoft Office folder, and choose Properties.

C:\Program Files (x86) or C:\Program Files.

  • Go to Security tab >> ensure ALL APPLICATIONS PACKAGES have Full Control. If an option Full Control is disabled, make it checked.
  • Then, click Apply >> OK.

error code 30015 Office 2016

Method 3- Check for the Setup File to Fix Error Code 30015 Office 2016

You can also check the setup file if you are having this issue while making office installation and you got ISO image file from MSDN subscription. This can be easily verified by plugging the installation media into another machine and now checking whether the setup runs perfectly or not.

Also Read: Resolve “SQL Server Does Not Exist Or Access Denied” Error

Method 4- Uninstalling VPN or Removing Proxy Server

As already mentioned in the causes section, an activated VPN client or Proxy server can cause this error. In this situation, you can try to uninstall your VPN application via the Programs & Features in the Windows 10 or 11. To remove the proxy server from a PC & check if this solves the problem.

Method 5- Uninstall Program From Control Panel

  • Uninstall the Antivirus from your system and restart your computer.
  • After the computer restarts, Open the task manager, and check whether any of the following processes are running:
    • setup*.exe
    • firstrun.exe
    • appvshnotify.exe
    • integratedoffice.exe

If any of the following is running then right click each one and then select End Task to make them inactive.

  • Uninstall the MS Office from your PC from the Control Panel and then Program and Features and select MS Office and select uninstall.
  • Then you have to delete all downloaded files of Office under Downloads
  • Now go to My Computer > C:/ > Program Files or Program Files(x86) > Here you will see Microsoft Office 15. Delete the entire folder, if you are unable to delete press SKIP or Cancel.

Access Denied To Installation Source

  • Then go to REGEDIT. Press CTRL + F & type Office15
  • On the registry, you will see Office tree. Delete the entire folder. Delete the 15.0 folder
  • You have to repeat this step till you see ‘Finish searching through the registry’ on the screen.
  • Then delete all the temp files from the RUN command and type %temp% and press enter.
  • Then type CMD and ipconfig /flushdns and restart your system.
  • Now reinstall the Office 2016 again.

Method 6- SFC Scan To Fix Access Denied to Installation Source- Error Code: 30015-4 (5)  

MS Office error code 30015-4 (5) is also encountered in case of system file errors or corruption. When this error occurs due to system file corruption, it can easily be fixed through the SFC scan. SFC scan or system file checking scan is a process in which a corrupt copy is either get replaced/repaired using the cached copy of the file from the directory.

Here is the complete step on how to perform this SFC scan:

Step 1: just open the command prompt in administrative privileges.

Step 2. Type “sfc /scannow” and tap on the Enter button.

Access Denied To Installation Source

Step 3. This will start the scanning process automatically.

Step 4. Until the scanning gets completed don’t close the command prompt until the scan gets completed.

Step 5. After that try installing or updating the MS Office application and check whether the error code 30015-4 (5) is fixed or not.

Also Read: Access Error 3146 ODBC Call Failed- Top 11 Fixes You Need to Know!

Method 7- Delete the Office Registry Sub Keys

Access denied to installation source error code 30015-4 (5) usually occurs due to registry corruption or some key value errors. The complete MS Office program stops working if a single key value gets corrupted.

So to fix Error code 30015-4 (5) is necessary to repair the registry keys and rebuild the string values. It is our recommendation that keep a complete backup of the registry repair as the registry is a highly sensitive element of the whole computer system.

Follow the steps to repair the registry:

Step 1. First of all Open registry editor.

Step 2. After that make the delete of the pre-installed or older registry key because of which installation of the latest version or update is get stopped.

Step 3. Search for the below keys and delete them.









Access Denied To Installation Source

Step 4. After that Change the DWORD values in the below keys from 0 to 1 in Office common registry folder.





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Preventive Measures

To avoid encountering this error in the future, consider following the below precautionary measures:

  1. Regularly review & correct the file permissions for smooth installation processes.
  2. Configure anti-virus & firewall settings.
  3. Check the installation source configurations twice to ensure they are accurate and up to date.
  4. Create a proper backup of your system files.

FAQs: Common Queries for Error 30015

Why Am I Getting the Error Code 30015 Office 365?

You are getting the error code 30015 Office 365 either due to permission issues or incorrect antivirus/firewall settings.

How Do I Fix Error Code 30015?

You can fix error code 30015 by applying the below tips:

  • Ensure to update your computer to the latest Windows updates.
  • Restart your PC.
  • Run the SFC (System File Checker) tool.
  • Create a new user account & install Office from there.

What to Do If Network Connectivity Is Triggering the 30015 Error?

If a 30015 error occurs due to a network connectivity problem, then you should check your network cables, restart your modem, and check router settings to ensure stable connectivity.

Can I Uninstall Office 365 And Reinstall It without any Error?

Yes, you can uninstall and reinstall Office 365 on your PC without any error.

Can Antivirus or Firewall Settings Cause this Error?

Yes, as already mentioned in this blog, antivirus or firewall settings may block access to the installation source files, causing the error. Disabling or adjusting these settings temporally allows the installation process to continue.

Also Read: Fix “The Changes You Requested to The Table Were Not Successful (Error 3022)” in Access


The error code 30015 Office 2016/2019 can disturb software installation processes, nevertheless, with an accurate solution, it can be solved effectively. By implementing the solutions outlined in this blog, you can overcome the Access denied to installation source warning message and install software smoothly.

Also, you should follow the preventive measures mentioned in this blog to avoid encountering similar issues in the future.


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Pearson Willey is a website content writer and long-form content planner. Besides this, he is also an avid reader. Thus he knows very well how to write an engaging content for readers. Writing is like a growing edge for him. He loves exploring his knowledge on MS Access & sharing tech blogs.