Wing FTP Server is distributed under shareware license, you can download and evaluate fully functional trial version for 30 days. After 30 days, you can continue use WingFTP as Free edition for non-commercial use.
If you need more features available in Standard / Secure / Corporate edition, please purchase a license and register it: https://www.wftpserver.com/order.htm
And the license includes a 2-year upgrade protection by default (the software itself never expires, all updates can be downloaded for free within two years). However, if you want to get longer protection period, you can choose from the options we offer after you click the purchase link. If your upgrade protection has expired or will expire soon, please contact us at firstname.lastname@example.org
On payment approval, we will send you the registration code (license key) within 12 hours, and it will be sent from email address: email@example.com (or firstname.lastname@example.org), please make sure your mail server won't block or filter this email address.