Hard Disk Monitoring

I have searched the website but have not found the terms of program updates.
If I purchase Hard Disk Sentinel Professional, what updates are included in my license?
What updates must be paid for?

I can confirm that (as displayed on the Store page ( http://www.hdsentinel.com/store.php ), the license grants lifetime use with lifetime free updates for all future versions.

This means that after placing an order, there are no further annual renewal / subscription / upgrade costs, you can use the current latest 4.40 version and all future versions (4.50, 5.00, 6.00, etc...) without any additional costs.