Mac OS X 10.11.6 - Update Lightroom 5 to Lightroom 5.7

Dear community,

i changed my Lightroom 5 installation from my Windows 7 computer

to an Mac Pro with OS X 10.11.6 (El Capitan). 

On Windows 7 i used to work with Lightroom 5.7, but my original DVD installed only Lightroom 5.0

on my Mac Pro.

If I try to update in Lightroom 5 (under 'help'), there comes the link to the Adobe-Site, but there is no link to the update which I need. Is there any possibility to get Lightroom 5.7.1?

I have a purchased Lightroom version with my serial numbers:

Lightroom 3 Full version CD with S/N,

Lightroom 4 Upgrade DVD with S/N,

Lightroom 5 Upgrade DVD with S/N,

all for Win and Mac

If this does not work, i would like to buy a legal copy of Lightroom 6.

Thank you for your help!

Stefan

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