That sidebar doesn't show on major landing pages, so it's not as silly a mistake as it might seem. I missed it for several minutes while looking around myself, as I started by following the prominent links on those landing pages. I only found the separate installation information page when someone else here helpfully linked to it.
Honestly, I hadn't even noticed the search box. It appears in a slightly unusual place and styled sufficiently subtly that I totally overlooked it throughout my entire browsing session. (FWIW, this is on a very large and colour-calibrated monitor on my PC, so my experience here may not be typical.)
In case it's of interest, as a new visitor, I started browsing from your main v2 landing page, scanning down most of that information. Then I followed the prominent download and get started links near the top. I think I next went to the documentation area, and started browsing the links on the left, though I totally missed the "Install" link just under "Welcome" because my eye was drawn first to the Tutorials section and its getting started link, and then I went exploring from there on down.
I suppose that was an unfortunate combination of two things to miss. :-)
