This error may indicate that the driver cannot locate the specified Client Library or that the library's bitness does not match the DSN's bitness.
The Devart ODBC Driver for InterBase interacts with the server through the client library using a special API.
The InterBase client library is distributed with InterBase. Additionally, the library's bitness must match the application's bitness.
To resolve this issue, install the InterBase client library and specify its path in the DSN settings, following the instructions provided at the following link:
Ensure that the required client library is available for the InterBase server version in use.

Questions regarding obtaining the client library are not related to the functionality of this driver.
Alternatively, the InterBase Developer Edition can be installed to obtain the required client library. For further assistance, contact InterBase technical support for guidance on downloading and installing the client library.