The software you're looking for, , is part of the Logger 5 software suite used to configure and read data from Keller pressure data loggers.
: Export recorded data into Excel (CSV) or graphical formats. keller logger 5.3 download
Keller Logger 5.3 is a specialized Windows application designed for the configuration, data retrieval, and visualization of Keller’s series of digital pressure transducers and data loggers (such as the DCX, D-Line, and Leo recorders). While the interface appears dated by modern UI standards, the software remains an essential, robust, and reliable tool for engineers and technicians working in hydraulics, hydrology, and process control. Keller Logger 5
Check if the USB driver is installed in the Windows Device Manager. Go to Settings → Communication Port