Unity claims no update available when there are new version available

Have you looked at your firewall? Perhaps the connection back to the mothership is getting thwarted

I noticed this too. Normally it does say something. I just went and downloaded from the website.

This has happened to me as well. Although Eric5h5's answer makes sense, my editor still says that there are no updates. $$anonymous$$y editor's version is 4.3.2.f1, however, 4.5.2 is already out for download. Should I wait until my editor realizes the new update, or just download a new version of Unity3D Pro?

It never worked nor said anything for me, it's always been outdated. They need to update their update tool.

I received my first update check notification today for Unity 5.2.2f1 to Unity 5.2.3f1. We'll see if things go the same for the next version. (The download button still brings you to the website so that you download the installer manually as you used to.)