Hi,
Even if you do custom installation it would have by default installed installer, just check for installed componets, you would find the Installer present
I think that you have to choose the installer explicitly when doing a custom install; at least in some versions. It's certainly true for 8.1.7 Release 3 for HP-UX PA RISC 64bit.
You can install it without stopping the database. I've done this myself.
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