I searched these forums but it doesn't appear that anyone has yet reported the bad link in the version details window that pops up on the plugins admin screen. (See attached screenshot.)
A few weeks ago I noticed the new blue page with Changelog details and links for installation instructions, download, support, etc. Click on the Download Now link and a new browser tab opens up with the same content as the pop-up.
Fore instance this is the URL tied to the Download Now link on the MarketPress Changelog pop-up
Note how it just loads the same page, click Download Now again and another tab opens, and so on...
MarketPress is just one example. I haven't seen a plugin yet over the past few weeks where the link works. The other links on the pop-up to forums and instructions seem to be working properly.