If you are using 64 bit os, the AOMEI menu entry is for Aomei Backupper.
That is because Aomei Backupper has 64 bit coded files.
Aomei partition Asst only comes 32 bit coded. It cannot run in native 64 bit pe.
If you want a partition manager in native 64 pe, Paragon does, but only the paid versions, using the Boot Media Builder files available from your Pargon account.
The only free 64 bit coded partition manager( as far as I know ) is Partition Guru.If you install partition guru Free or Pro, then create your pe, it should be automatically included under the menu entry "PGURU" http://www.eassos.com/download.php