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This app has been blocked for your protection

Notice

This document is a machine-translated draft and is currently undergoing review. Some content may be inaccurate or differ from the original Korean version. For the most precise information, refer to the Korean documentation.

  • Error message: "This app has been blocked for your protection."
  • Summary: Player installation or execution failure due to Windows security features and account permission issues

Symptoms​

An error message is displayed when installing or running Kollus Player, and the process does not proceed further. The same issue may occur even after closing any running security programs.

Cause​

This occurs when the super administrator (Administrator) permissions or the User Account Control registry of the Windows local account currently in use become corrupted. The primary cause is a malfunction in the Windows operating system's own security system, which forcibly blocks the execution of safe programs.

Solution​

It is recommended to create a new administrator account and run the application from there.

Step 1: create a new administrator account​

  1. Press [Windows]+[I] on your keyboard to open the Settings app.
  2. Navigate to [Accounts] > [Other users] (or [Family & other users]).
  3. Click the [Add account] (or [Add someone else to this PC]) button.
  4. When the Microsoft account sign-in window appears, select [I don't have this person's sign-in information] > [Add a user without a Microsoft account] at the bottom.
  5. Enter a username (English recommended) and password for the new account, then click [Next] to complete account creation.
  6. Click on the newly created account name, then click [Change account type].
  7. Change the account type from [Standard User] to [Administrator], then click [OK].

Step 2: sign in with the new account and run the player​

  1. Click [Start] > [User profile icon].
  2. Select the administrator account you just created to switch accounts.
  3. In the new account environment, try downloading Kollus Player again or run the installation file.
See Also

For detailed local administrator account creation procedures by Windows version, refer to the Microsoft official guide.