Dynamsoft TWAIN Products

When i try to add Dynamic twain 4.1 trial to form (Visaul sudio .NET 2003)
that gives error: "You do not have a license to use this ActiveX"
Whats problem?

Please check the license information of Dynamic TWAIN in "Licensing Tool". The "Licensing Tool" can be found at "Start -> All Programs -> Dynamic TWAIN 4.1 Trial". If you do not have a trial license or your trial license has expired, please write to catherine@dynamsoft.com and Catherine will send you an extended license.

Thanks.