InstallPKG 0.3 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. InstallPKG for Mac lies within System Tools, more precisely General. We recommend checking the downloaded files with any free antivirus.
From the developer:
InstallPKG is aimed at system administrators. It is a utility which makes installing multiple packages in a specific sequence simple.