"Lifetime License" means that you can use the purchased version of the product as long as you want and as long as the computer you use it on meets the initial program system requirements.
All Vovsoft products are sold with a lifetime (perpetual) license and updates are always free of charge. No strings attached.
Vovsoft products can be activated using both online and offline activation. The simplest one is online activation. You just enter your license key and it activates immediately if everything is fine. Current Vovsoft programs, once activated, do not need to connect to the online activation server again.
In cases where there is no internet or our activation servers are not working properly, you can activate offline. For offline activation, you need a previously generated offline activation code in addition to your license key. For the worst case scenario, we recommend that you create a virtual machine (using VMware, VirtualBox, Parallels) and keep your offline activation code for that computer.