Powerpac 6.0.1 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This program was originally created by Spearhead Software. The most popular versions of the program are 6.0 and 5.5. We recommend checking the downloaded files with any free antivirus. The Powerpac installer is commonly called PowerPAC.exe, Powerpac5.exe or PowerPac7.exe etc. The software lies within Education Tools, more precisely Science Tools.
From the developer:
PowerPac is Australia’s most popular Electrical Calculation Software program designed to assist the user of the Australian Standards AS/NZS 3008.1:2009 and AS/NZS 3000:2007. It is designed to reflect the complex mathematical functions described in these Standards with the object of ensuring accuracy, consistency and reproducibility.
You may want to check out more software, such as ABB ArcWelding PowerPac, which might be similar to Powerpac.