HTBasic 2021.1 Update of Full Development version. Download Only. Single User Perpetual license. Updates are free if the previous version was purchased within the last 90 days and for one year following purchase of a new Full Development License. After one year, updates may be purchased for the current Update price. An Update license key (serial number) will be generated from the previous license key. Upgrading from versions older than the previous “major” release requires purchase of a new Full Development License. Optional add-ons include a Getting Started Guide and a 4GB USB backup drive with storage for programs and data. Please allow 24 hours for License Keys to be emailed after an order is placed.