QuickBooks Update Error 15106 usually occurs when the update program is blocked or can't access necessary files due to permissions or security software. This error often displays the message: “The update program cannot be opened” or “The update program is damaged.”

Common causes include insufficient admin rights, interference from antivirus or firewall programs, or corruption in the update files.

To resolve it:

1. 
   

   Run QuickBooks as Administrator – Right-click the icon and select "Run as administrator."

   
   


2. 
   

   Disable Antivirus/Firewall Temporarily – Security programs may block updates.

   
   


3. 
   

   Check User Account Control Settings – Set it to a lower level temporarily.

   
   


4. 
   

   Rename the Download Folder – Navigate to C:\Program Files\Intuit\QuickBooks\Components and rename the "DownloadQBXX" folder.

   
   

If none of these steps work, consider doing a clean install of QuickBooks. Always back up your data before attempting any fixes.