Make sure which model your power strip is. To do this, look for the item number on the back of the power strip on the product label.
There are 3 different Web Line models:
1156057984 (The current model in the range)
1156057994 (Old model, no longer in the range)
1951150600 (Old model, no longer in the range)
You can find the corresponding software and instructions on the linked pages in the downloads section.
Install the software that corresponds to your power strip.
Please feel free to download the instructions first to learn how to install the software.