Nuendo 5.5.6 on OSX 10.9 Mavericks

Hello there Hugh or ?…
I finally put OS 10.9.5 on a separate SSD and now attempting to re-build all SW from scratch.
(kept 10.6.8 and all SW on the other drive as a b/u)

I have the 5.0 Nuendo disk that I loaded & then downloaded 5.5.6.
The problem is you cannot install 5.5.6 without 1st installing 5.5 and I simply cannot find a 5.5 ver. anywhere on their site?

Before I email Steinberg I thought to ask if anyone has any insight here.
Much thanks if so…