1) All current version updates are free. We normally put up updates every 2-4 weeks.

2) When we release the next version , you would have to purchase an upgrade to use it. You could continue using your purchased version without upgrading as long as you like. 

3) At the time we release the new version, we stop putting up old version updates.  Any bugs or suggestions found and reported in an old version will only be fixed in the latest version. 

4) Users of older versions are requested to purchase the upgrade to the new version.  No free major version upgrades are provided under any circumstances.  We work hard to provide regular updates to the new version based on feedback/bug reports.  And we expect our users to support us by upgrading to the new major version when released.. 

5) Typically the upgrade price is ~50% of latest version price.

6) We will stop supporting a version when its end of life is reached.  The exact EOL time is listed here.