How to fix 'Installation failed with error 5'.

Installation failed with error 5.

When you receive the message Installation failed with error 5 during license activation, it means that the standard method (via product key) did not succeed. This usually happens due to security settings, firewall rules, or a missing internet connection that prevent the activation from completing online.

The solution is to perform a manual installation via a C2V/V2C exchange.

PROCEDURE

1. Close Pythagoras completely
   Make sure the program is no longer running.
   
   

2. Open the Sentinel Admin Control Center
   In your browser, go to: http://localhost:1947
   
   

3. Create a C2V file

   • Go to the tab Sentinel Keys

   • Find the correct key in the list

   • In the column Actions, click the button C2V

   • The C2V file will be automatically downloaded (usually in your Downloads folder)
     
     

4. Send the file
   Email the C2V file to: support@pythagoras.net
   
   

5. Receive and install the V2C
   Our support team will then send you a V2C file.

   • Start Pythagoras

   • Go to Licensing > tab Apply V2C

   • Click Update and select the V2C file

   • Close the window and restart Pythagoras
     
     

Your license is now activated and Pythagoras is ready for use.