Single-user licenses allow 1-3 simultaneous activations (depending on terms). If you activated on multiple VMs or old computers, the limit is reached.
: Registered users with eligible annual licenses may receive complimentary upgrades to the latest versions, such as Stata 19 or StataNow . Check for an email from no-reply@stata.com to verify your address and receive new license info. stata+license+and+activation+key+new