If you need an older, legitimate version (e.g., 12.1, 15.x), contact PremiumSoft support directly — but 8.2.16 is not a valid release.
The flagship feature of the Premium edition was its ability to connect to MySQL, PostgreSQL, Oracle, and SQL Server simultaneously within a single application. For a DBA managing version 8.2.16, this meant they could migrate data from an Oracle warehouse to a MySQL web frontend without ever leaving the Navicat window. This cross-platform compatibility drastically reduced the learning curve for junior administrators moving between database languages. Navicat Premium Enterprise Edition 8.2.16
The layout was logical: a connection pane on the left, a main workspace in the center, and property grids on the right. The tab If you need an older, legitimate version (e