The latest v2.x build can be downloaded from here.
For licensed users of any v1.x release, the upgrade cost is $10.
(Quantity discounts are available - contact us for details).
There is no fee to upgrade from v2.x to v2.2! 
(however, donations are gratefully accepted!, and can be made below).

Once your current license status is verified, you will be emailed a new v2 key.

For an additional $7.95, we can mail you a CDROM containing the current, plus all previous versions of ZTreeWin.