Adobe has locked down the way you can download and install Flash Player on computers that may not always have an active Internet Connection.
In this case you usually would look for the link which says “offline installer.”
However, Adobe does’t make this easy to do, as the links are hidden deep within the Adobe site.
I stumbled across the links under the title “Adobe Flash Player Distribution.”
This page provides links to all versions of the latest Adobe Flash and provides them in both Mac OSX and Windows flavours.