Your license never expires, but your access to updates and priority support do. All licenses of Terragen 4 come with 1 year of Mainteance, which includes any updates during that 1 year. After that year you need to pay to access newer updates, but you can choose not to, and still use your current version as long as you like. When a new release comes along that includes a must-have feature for you, then you can renew Maintenance at that time and get access to it, and all other updates for the next year after that.
- Oshyan