Converting format depends entirely on what the file contains. Most common PKG files are either macOS installers PlayStation backup packages 1. Converting macOS Installers (Mac/Windows) If you have an InstallAssistant.pkg
Old guides recommend tools that no longer work on modern Windows 10/11 or macOS. Here is the current stable toolkit: how to convert pkg to iso updated
Are you converting this for or for a gaming console emulator? Converting format depends entirely on what the file contains
hdiutil convert macOS_Installer.sparseimage -format UDTO -o macOS_Sonoma.iso how to convert pkg to iso updated