DiffEngineX is free to use for the first 30 days.

A purchased registration key allows you to use the software after the free trial period expires.

If you have purchased DiffEngineX more than a year ago, you need to purchase an upgrade before you will be issued a registration key for the latest version. We will, of course, re-issue registration keys for the version you are entitled to use.

Upgrading to the latest version is free for one year after purchase.

We can discount the upgrade fee if the software is used at home for personal use.