Install/useage instructions for MarketPress, including do I need to re-do all settings/product listi

I am looking for instructions on how to install/use the upgrade to MarketPress I just purchased (2.8.5). Also, will I need to pretty much do a whole new set-up of the products, settings, etc.? I am already running an older version and I’d rather not have to re-do all of that work if I don’t have to. Thanks in advance!