This is a known issue with older Chinese DVR software. In this situation, you have three options: 1) Search your email backups thoroughly. 2) Use a registry extraction tool on the original hard drive. 3) Replace the software with an open-source alternative (e.g., VLC or OBS for viewing, Grafana for analytics).
No, but you may lose access to updates after 1 year. Subscription licenses: Yes, typically after 12 months. You need a new renewal serial number. Smartview Activation Serial Number
Finding a "Smartview" activation serial number depends on which specific product or software you are using, as the name is used by several different companies. TI-84 Plus Go to product viewer dialog for this item. This is a known issue with older Chinese DVR software