This site also hosts the same driver package and even links back to an old Acer Japan support page, adding to its credibility.
What or vendor name did you find in the Device Manager? Are you getting a specific error code during setup? Share public link acer aspire 4730z bluetooth driver windows 7
: Ensure your laptop's physical Bluetooth switch is turned on (indicated by a blue or green light on the chassis). This site also hosts the same driver package