Our site (veetle.com) requires a video player plugin to be downloaded before you can play any video on the site. We've always had an inline install prompt when you enter into the video page:

Now some co-workers believe that this isn't enough. They now want a standalone download page linked in the primary navigation:

My concern is that this link in the primary navigation is taking up more real estate than it should:
(A) I believe the average user thinks that most video sites don't require a new plugin to begin playing video. Virtually all other sites like Youtube and Hulu use the Flash video player, which 99.9% people already have installed. Thus, new users to our site won't be sniffing around for the standalone download page when they first discover our site. They'd rather click into a video page, expecting video to play right away, and be presented with our tried and true inline install prompt.
(B) Once our plugin is downloaded, you will never need to download it again (unless we do a mandatory upgrade, which only happens only once a year). So this standalone download page is only useful 1 day out of the entire year! My thought on primary naviagtion is that it should only be used for high traffic pages. Polluting primary navigation with useless pages decreases usability because there will be some novice users who click into the page and ask "huh???? why do I need this page???"
What are your thoughts?