Software updates are made available for download from the Stormdance web site. Often there is a facility to check for new releases from within the software.
Minor updates (e.g. version 1.1 1.2 1.3 etc.) are FREE for existing customers.
There may be a charge for major releases (e.g. upgrading from version 1.0 to 2.0) however your old key does not expire (it is not a subscription), so there is no obligation to upgrade.
If a major release arrives within 6 months of purchase, then you get the new version free! Total peace of mind.