virus protection for a RN10200 connect to network by Wi-Fi.

I have a 10200 NAS connected by Wi-Fi to my router.  I have no problem connection to the NAS through an extender, but the nas apparently does NOT recieve virus updates.  I also have a 31440 NAS that has a wired connection, and it gets the virus updates with no problems.  Has netgear ceased to support the 10200?  And if so, is there any way to download the virus program and install it separately.