The Elveflow Smart Interface (ESI) latest version can be downloaded from this page.

Just reach the DOWNLOAD tab to access the ESI download links (see the image below for the details).

The archive contains a SDK subfolder for any user looking for building a custom interface.
ESI has to be installed to ensure the availability of every resource required to communicate with the instrument. 

For X64 libraries, LabVIEW X64 Run-time should be installed. It is included in the installation file (Extra Installer for X64 Libraries). 

ESI and SDK documentation are included in the archive file. 

Downlolad and unzip the archive into your computer desktop to access contents and install the files.