How To Fix "This Installation Package Could Not Be Opened" Error on Windows

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Windows sometimes can’t open an installation package, but don’t despair yet; there are ways to fix it. Users often post about software installation issues on Windows support forums. One such reported issue is a Windows Installer error that sometimes occurs when users try to run program setup files. The Windows Installer error message says, “This installation package could not be opened.” That error means you can’t install the software, but its message provides no clues for potential causes. The message only says to check if it’s a valid installer package, which it usually is

Now let’s go through all the possible methods to fix this installation Package Could Not Be Opened error. Below are the methods demonstrated using step by step approach.

1. Run the Installer as Administrator Privileges & Unblocking the Files

In this method, we will make sure that using the admin privileges to fix the issue. However, if this installation Package Could Not Be Opened error persists we will unblock the file. Follow the steps.

Step 1: Right-click on the installer file, now from the menu click on Run as administrator

If the installer is running without error your error is fixed

Step 2: However, if you are still getting the error, again right-click on the installer

Now go to properties, in the General tab, go below

Step 3: Click on the unblock button, now run the installer without the installation Package Could Not Be Opened error

2. Starting the Windows Installer Services

If the error still persists maybe the installer service is either disabled or not responding. Follow the steps to fix the how do you fix this installation Package Could Not Be Opened issue.

Step 1:  In the Start, menu type run and hit enter

Once the run window is opened up, type services.msc and hit enter

Step 2: In the services, window locate the Windows installer service

Once you have the service, right-click and go to Properties

Step 3: First make sure that the Startup type is set to Automatic

Now, move a little below Click the Start button to start the service

Step 4: If the status of the service is already running, restart the service

Save all the changes and restart the system to get rid of the installation Package Could Not Be Opened error.

3. Tweaking the Registry

We suggest you try all the other patch Package Could Not Be Opened methods first. This method requires changes in the registry. While making changes in the registry follow each step carefully to avoid any system instability.

Step 1: In the Start, menu type run and hit enter

Once the run window is opened up, type Regedit and hit enter

Step 2: Once the registry window is opened, navigate to the below path


Once you get to the FileSystem key, move to the right plane

Step 3: On the right plane locate NtfsDisable8dot3NameCreation

Now right-click on NtfsDisable8dot3NameCreation, now open its properties

Step 4: In the Value Data field delete the existing value and put 0

Step 5: Same way, double click on “Win31FileSystem” to modify it’s value data

Step 6: In the Edit DWORD (32-bit) Value window, make sure ‘Value data:‘ is “0“.

Finally, click on “OK” to save the changes.

Save all the changes, restart your system, and your installation Package Could Not Be Opened verify that the package exits issue will be fixed.

4. Re-register the Windows Installer engine with CMD

Step 1. Click on the window and type cmd

This will open the Command Prompt window with administrator rights.

Step 2:  To unregister and re-register the Windows installer service, copy-paste and hit Enter.

msiexec /unregister
msiexec /regserver

Close the Command Prompt window on your computer.

Reboot your computer to save the changes.

After rebooting, try to install the package again on your computer. Your problem should be solved.

5. Disabling the Antivirus

If this installation Package Could Not Be Opened Windows 10 error still continues to occur we suggest that you disable the Windows firewall. If you are using any third-party antivirus disable that too. Antivirus and firewalls block certain programs and services from running.

Step 1: Press windows+R to open the Run window

Enter firewall.cpl

Step 2:  In the firewall window, click on Turn of Windows Firewall on or off

Now disable the Firewall for the private and public networks to get back of this patch Package Cannot Be Opened contact the application vendor to verify that problem.


In this error-solving guide, we have seen multiple methods to fix the installation package that could not be opened error. We have given brief information regarding the causes of this issue as well. We hope by following this guide your issue will be fixed.

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Good Luck!