We introduced Gradience version 12 in May 2017 but we pulled version 12 in late January 2018. We did this because Windows 10 updates rendered Gradience version 12 no longer functional on Windows 10. We hope to re-release version 12 very soon.
In the meantime, the latest Gradience Pro/Enterprise version [available] is 11.0.1606.29.
The 16 refers to the year 2016.
The 06 refers to the month of June.
The 29 refers to the day-of-the-month.
You can find your full, multi-digit version number by opening the software and clicking Help > About.
If you're running a version older than 11.0.1605.10 of Gradience Pro / Enterprise, you [MUST] use Firebird 1.5 as your database engine.
If you are running version 11.0.1605.10 or version 11.0.1606.29, you may use Firebird 1.5 or Firebird 2.0.7. as your database engine.
If you are running version 12, you [MUST] use Firebird 3.0 as your database engine.