At January 2022 HScope licenses (Oscilloscope base license and additional Modules license) are charged 1 time and keep unlimited validity. When you buy a license you can use all the features provided by that license plus free updates for the new features released within 1 year from the purchase.

New features released 1 year after the last license purchase date will require to purchase an yearly update which will provide all the features up to the current date, plus free updates for the new features released within 1 year from the purchase date of the update.