Do those of you with 14+ gig directory sizes still have a file called Aion_Main_0.0.0.0To1.0.2.10.ncpatch inside your Aion directory? If so that is the archive the launcher downloads to install Aion. From my experience it should be deleted automatically either at the end of the install or when you first successfully launch Aion.
I've used that file to install Aion on 3 different comps now without Aion having to download anything so I'm certain that's what it is for. If you do have that file and have ran and played Aion successfully, and it hasn't been removed you are
probably safe to delete it. Or at the very least move it out of your Aion directory until you have verified it still works ok without it (for myself with a directory size of 7.83gb it works fine). Please note the probably tho.. I am giving this advice based on the fact it works for me
