Here are the few frequently asked question.
: In some versions, you can open the email containing your license data, select all text ( Ctrl+A ), copy it ( Ctrl+C ), then open Total Commander and press Ctrl+V in any directory to trigger the registration dialog. Troubleshooting Verification Installer - TotalcmdWiki - ghisler.ch
. Below is a "paper" or technical overview of the components and the verification mechanism.