1.0.2 (1C28) Would anyone know why my installer app would just disappear off my home screen?

I was just got off the phone while I answered a call while downloading applications, and after I got off the phone it reseted to the slide menu and when i arrived to the home screen around 5/8 apllications were there that I downloaded and no INSTALLER !!
Someone Please ASSIST w/ advice ASAP~*