Never used Porteus Installer inside the Porteus Settings Centre, so thought I'd try it. I thought this would create a generic Porteus on a spare usb drive I had, much like an initial install after download.
"Why is this taking so loooong to complete? Problems? Permissions? Didn't check the sha256? Corrupt target drive?" Although told not to, I was yanking drives, shutting down, restarting the procedure over and over.
What I didn't know is that it makes a complete duplicate of what you already have! (very cool) And that meant about 4 or 5 other massive iso downloads in my Downloads directory that I had before. So yeah, I'll be clearing out my junk before I make another one!

Awesome, but I felt like a dunce once I waited long enough for it to handle all my unnecessary baggage and tell me it was all done.