Download of PL-100 Configuration Utility 3.1.0.2 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The software is included in Internet & Network Tools.
This free software is an intellectual property of ZyXEL Communication Corp. The following versions: 3.1, 3.0 and 1.0 are the most frequently downloaded ones by the program users. We recommend checking the downloaded files with any free antivirus. Zyxel PL-100 Utility.exe is the most common filename for this program's installer.
From the developer:
the pl 100 power line 85mbps ethernet adapter transforms a house's existing electrical wiring into a powerful networking infrastructure.
the pl 100 plugs into an ordinary outlet to easy extend a cable/dsl broadband connectin or existing ethernet network to any other electrical outlet
You may want to check out more software, such as Yubikey Configuration Utility, Device Configuration Utility or NVIDIA Maximus Configuration Utility, which might be similar to PL-100 Configuration Utility.
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