Re: Google Now App & Stupid Me!
Google Now (i.e., that Google Search screen that shows you various cards you might be interested in, about weather, sports, recent searches you made, etc.) is integrated with Google Search. So if your Google Search app is fully updated, you should be able to access Google Now--typically by long-pressing the Menu button. The Google Now Launcher just makes it more easily accessible as the leftmost homescreen, but it isn't necessary to run Google Now.
You probably just have to set up your homescreens all over again.
You can find out what version you have by going to Settings>About Phone>Android Version.