Additionally, sometimes people are just curious about what exactly is going on behind the scenes, and what is going to be run by the package installer and where it intends to put files on a Mac.

The first is Package Info which shows an overview including how many items will be installed, the size of the installation, the developer ID and if it is signed (if applicable) and valid or expired, how many installation scripts are run, and where and when it was downloaded.

If youre downloading all of your apps, updates, and packages from Apple.com or an equally trustworthy location, you may find Suspicious Package to be interesting but not particularly noteworthy since the source is trusted, though even packages from Apple can encounter weirdness like having a pkg get stuck on Verifying which can sometimes be troubleshooted through a utility like this.

Where Suspicious Package really gets useful is in more advanced situations where higher Mac security is necessary and where users want to be sure a file is trusted and an installer isnt doing anything sketchy when its run.

More advanced Mac users can still extract pkg files with pkgutil without actually installing them but it requires the use of the command line, and the Show Files method to see what files are going to be installed and where to is not always available or detailed enough.

You can create ramdisk for this purpose and then inspect the files there.

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Pkg File Extrator App For Mac