When will be 16.5 update come to my computer?

i am feeling jealous why some people have got 16.5 update and i am still on 16.2 version of NIS 2009

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Norton Internet Security 2009

Genuine Windows Vista Home Premium SP1 x86

Intel Core 2 Quad Q6600 2.40 Ghz

8 GB RAM

Intel G35 Motherboard