After upgrading to Windows 10 I'm getting an activation message

The first time Read&Write is opened after your computer has been upgraded to Windows 10 a message saying there was a problem with activation will be displayed.

 To resolve this, download and run the Windows 10 Activation Tool.

Windows 10 activation tool

Click on Activate

If you get the message Read&Write 11 has detected a problem with the serial number the next time Read&Write is opened, please contact us with your serial number and details of the issue.