Fix: System policy issue prohibited this installation

While installing a specific application on your office laptop, you may be blocked by this error message "This installation is prohibited by system policy. Please contact your system administrator. ". In fact, system administrators do not allow users to install anything from third-party or foreign, unapproved sources. They develop systematic strategies to do this. Just follow the steps below to unblock this policy and install the app.

WARNING -

This policy is managed by your IT administrator and prohibits the installation of any foreign objects. This is usually done to protect the system from external interference and maintain standard security. So before you change your policy or use our registry hack, make sure it's safe to do so.

Fix 1 – Modify Group Policy

If you are a Windows 11 Pro user, you can simply adjust Group Policy to resolve this issue.

1. Follow the steps below to open Group Policy – ​​To do this, press the ⊞ Win key and the R key simultaneously.

2. Then just write this in the terminal and press Enter.

gpedit.msc

3. Once you land on the Local Group Policy Editor page, go to this place-

Computer Configuration > Administrative Templates > Windows Components > Windows Installer

4. Here you will find several policies.

5. Simply search for the "Prevent non-administrators from applying vendor signature updates" policy and double-click it.

6. You must disable the policy setting. Select "Disable".

7. After that, click "Apply" to apply this modification and click "OK" to complete the process.

After making this change, close the Local Group Policy Editor. Then restart the computer. After restarting, try installing the application package again. Test if this works for you.

Fix 2 – Use Registry Editor

If you are using Windows 11 Home or your system has restricted policy changes, you can use our registry tips to achieve the same results.

1. First, open the Registry Editor. To do this, just press the

Windows key and the R

key at the same time. 2. Now you can enter this simple line and press

Enter

.

注册表编辑器

WARNING

– The Registry Editor is one of the most sensitive areas of your system. Therefore, before you do anything else, you should make a registry backup beforehand. Just do this - kind of. Once the Registry Editor screen opens, click "

File

" in the menu bar. Bay. Then click "

Export

" to create a new registry backup on your system.

Save this backup in a safe location on your system so you can access it when needed.

3. Once the backup is complete, go to this subkey under Local Computer -

HKLM\软件\策略\微软\Windows

4. Now, look for the “

Installer ” subkey under the Windows key.

[

If you cannot find that specific subkey, you must create it. To do this, follow these steps -

A. Just right-click the "

Windows

" key and click "New>" and click "Key". Bay. Name this new key "

Installer

".

]

5. Simply select the "Installer" key from the left.

6. On the right side, right-click and click "

New>

" and "DWORD (32-bit value)".

7. Name this new value "

DisableMSI

". 8. After naming the value,

double-click

it.

9. You can set the value to "

0

" and press Enter.

After making this change, close Registry Editor.

Restart

your machine. Later, try installing the app or updating an existing app. Fix 3 – Change Software Restriction Policy

If you are unable to sideload packages even after applying registry fixes and/or Group Policy changes, try this fix.

1. You must turn on local security policy. To do this, press the

Windows key and the R

key simultaneously. 2. Then, click on “

secpol.msc

” and click on “ OK ” to access it.

3. When Local Security Policy opens, select "Software Restriction Policy" from the left pane.

Now, if you notice "Undefined Software Restriction Policy" on the right, then there are no software restrictions enforced on your system and you can skip this fix.

4. If there is indeed a software restriction policy that is executed, double-click the "Execution" policy to access it.

5. In the Enforcement Properties page, find "Apply software restriction policy to the following users:" and set it to "Except local administrators All users".

6. Afterwards, click "Apply" to cancel the enforcement, and click "OK" to complete the process.

Close the local security policy window. Finally, you can restart your PC/Laptop and start installing the application package.

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