First check the Oracle version number and digits. My approach is to create a new query in pl / sql, enter select * from v $ version, the following results.
OK Oracle, Navicat, OracleClient of digits to ensure that the number of bits of your oracle database with the same number of bits navicat
https://www.oracle.com/technetwork/topics/winx64soft-089540.html
In this page you downloaded and consistent database version instantclient, and your database version to be consistent.
Corresponding version of my database is as follows.
Download the complete navicat general on the inside. It also has inside a directory name instantclient get rid of, and then you download into the directory, online information mostly say only replace oci.dll files on it, it's wrong, must the entire folder are on the inside!
Open navicat-> Tools -> Options -> Environment -> oci environment, you just choose to download instantclient, find oci.dll, set to the path on it, Navicat aspects be configured over! Restart test!
