Today, when I tried to run an eDiscovery Export (ClickOnce application), an error appeared stating “Your administrator has blocked this application because it potentially poses a security risk to your computer” and “Your security settings do not allow this application to be installed on your computer”.

your administrator has blocked this application

This message seems to be due to strict or incorrect settings in Internet Options of Internet Explorer. However, in 9 out of 10 cases, only a few registry settings need to be changed.

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1 Solution for Your administrator has blocked this application because it potentially poses a security risk to your computer

1.1 Step 1. Open Registry Editor

1.2 Step 2. Navigate to HKLM\SOFTWARE\Microsoft\.NETFramework\Security\TrustManager\PromptingLevel

1.3 Step 3. Set Internet, LocalIntranet and TrustedSites to Enabled

1.4 Step 4. Re-run the application

1.5 Step 5. Install the application

1.6 Step 6. Uninstall the application if needed

2 Additional information

Solution for Your administrator has blocked this application because it potentially poses a security risk to your computer

You will most likely solve the Application Install – Security Warning by adjusting 3 registry values. By default, .NET Framework settings block the installation of all ClickOnce applications. Which is a good thing in the first place, because running any application without knowing could lead to serious security issues. However, in this case, we want to allow the application to run. In the following how-to, you learn how to fix Your administrator has blocked this application because it potentially poses a security risk to your computer:

How to fix Your administrator has blocked this application because it potentially poses a security risk to your computer

Step 1. Open Registry Editor

Click Start , type Registry and open Registry Editor. If you are asked if the application is allowed to make changes, click Yes.
If in doubt about required permissions, run Registry Editor as administrator

Step 2. Navigate to HKLM\SOFTWARE\Microsoft\.NETFramework\Security\TrustManager\PromptingLevel

Navigate to Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\Security\TrustManager\PromptingLevel
For all register entries, the Data is probably set to Disabled.

Step 3. Set Internet, LocalIntranet and TrustedSites to Enabled

Fix for Your administrator has blocked this application because it potentially poses a security risk to your computer 2

Double click and adjust the Data to Enabled for these entries: Internet, LocalIntranet, TrustedSites

Step 4. Re-run the application

application install security warning clickonce

Try to run the application again. You do not have to restart the browser. You should now be prompted to Install (or to Not Install) the application

Step 5. Install the application

Click Install to install and run the application.

Step 6. Uninstall the application if needed

If you ever want to remove the application, go to Programs and Features / Apps & Features. From there you can uninstall.

Additional information

The error “Your administrator has blocked this application” may occur in your browser, such as Internet Explorer, Microsoft Edge, Google Chrome or Mozilla Firefox. But the window may also popup when you double-click the application file from Windows File Explorer. In either case, changing the registry keys may solve your problem.

The error has also been reported with the installation of Windows 10 IoT Core Dashboard, BIM 360 Glue Desktop, Fidelity Active Trader Pro and Deltek Ajera.