Solution 1

• Right click on the *.exe.
• Choose “Run as Administrator”.

Solution 2

Add a new user account on your computer and try to install ConCrete using that account.

• Go to Start > Control Panel > User Accounts. Choose ‘Manage another account’.
  
• Click on ‘Create a new account’.
  
• Follow the instruction of the wizzard.
  At a certain point, the wizzard will suggest to make a Windows-account for the new user. But since we only want to use this new user to install ConCrete, creating a Windows-account is overkill. Just select twice that you want to add a user WITHOUT a Microsoft-account.
• Once
• Make sure the new user has Administrator rights.
• Once the new user has been added to you computer, log in and install ConCrete using that account.
• Once ConCrete is installed, you can delete the user account.