The installation packages you need for your PC related to pLog depends on what software you have installed on your desktop and what you need to do on your PC related to pLog.
The bitness (32 bit or 64 bit) of either Excel and/or LogPlot is one consideration - note gINT is always 32 bit which is why it is in its separate installation package.
The second thing to consider is what tasks do you need to perform related to pLog on your PC. See below for help determining what you need to install.
This document provides detailed instructions on how to figure out the bitness and what to install.
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