The Daz3D install routines have changed over the years, but Aiko 3 is pretty recent. Once you've installed one, the folder for that will be the default for the next, if you're using Pakled's method. I'd just let the installer handle it. Check it's going to the right Poser runtime. Make sure you have the uninstall option active. The Opera web browser gets confused by the readme option. Pakled is talking about potentially huge sets of figures and props and stuff for Poser. It's not something to worry about yet.