Choose this for the normal installation method, which allows you to choose all options yourself.
Normal installation is recommended if you have difficulties with the "Smart" Installer working as expected, or if you have merged any plugins of other mods. However, you will lose the benefits of the "Smart" Installer informing you of any potential incompatibilities that would result in AOS and/or your other mods not working properly.
If you have merged plugins of other mods, please note that most of the AOS compatibility patches refer to other mods' plugins as "masters," and they won't work if those plugins are missing from your load order.