installing .pkg doesn’t overwrite old version?

[luomat]

I have a script which updates SuperDuper, which involves downloading the .tar.gz and then unpacking it before installing the .pkg which is done like this

sudo /usr/sbin/installer -verbose -pkg 'SuperDuper!.pkg' -dumplog -target / -lang en

The problem is that the package does not seem to actually overwrite the old version.

Instead, the new version gets installed to

/tmp/superduper_install/

which seems very unusual.

I realize I’m doing it “unusually", but am I doing it “wrong"?

[dnanian]

Yes. You should just let it do it itself... why would you do it this way?