Why would Skype suggest an update that isn't compatible with my current OS?

[rgG]

haikuman wrote:
System requirements
1GHz Intel processor
Mac OS X v10.5.8 (Leopard) or newer.
100 MB free disk space.
Either USB or regular headset if your Mac does not have a built-in microphone.
Download drivers if you are using an external webcam.
For voice calls recommend broadband connection with 100 kbps down / 100 kbps up.
For group video calling everyone on the call needs Skype 5.0 for Windows or Mac or higher plus webcams, and at least one person needs a group video calling subscription. For best quality we recommend you use a high-speed broadband connection of 4Mbps down/512kbps up and a computer with a Core 2 Duo 1.8 GHz processor. As a minimum you’ll need a high-speed broad connection of 512kbps down/128kbps up and a computer with a 1 GHz processor.

http://www.skype.com/intl/en/get-skype/on-your-computer/macosx/

I should add I am running 2.8.0.851 which is a very old version that I like *(:>*

But, they don't tell you any of that when the dialog pops up telling you to update. I found and downloaded 2.8.0.866, which seems to work; at least the test call worked. This was probably the version I had before the update wiped it out.