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What is the name of the device that you are changing, it is a led but what is the component name?
Did it have a package or are you adding a new one?
when you press assign package do you see a dialog that asks to save the package to a library?
Ho do you get to this dialog?
is it by right clicking on the component on the schematic and selecting packaging tool?
In that case I get a save dialog when i press assign package, i don't know why you don't get that dialog.