NAV 2009 R2 differences in version

MOSAHEB
MOSAHEB Member Posts: 6
I've a client having Nav 2009 R2 Version W1 4.0 SP1 (6.0.32012) and I've downloaded the Nav 2009 R2 from Microsoft which have the following version:

Nav 2009 R2 Version W1 6.0 R2 (6.0.32012)

So what the difference between the two versions and how to upgrade the Version W1 4.0 to Version W1 6.0

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