I have heard that CS2 is availble to dowload free,
Not according to Adobe.
The web is full of rumours about free CS2 - may or may not be false at this stage.
Dov Isaacs (Adobe employee):
"On behalf of Adobe Systems Incorporated ...
You have heard wrong! Adobe is absolutely not providing free copies of CS2!
What is true is that Adobe is terminating the activation servers for CS2 and that for existing licensed users of CS2 who need to reinstall their software, copies of CS2 that don't require activation but do require valid serial numbers are available. See <http://forums.adobe.com/thread/1114930>."
Effective December 13, Adobe disabled the activation server for CS2 products and Acrobat 7 because of a technical glitch. These products were released over 7 years ago and do not run on many modern operating systems. But to ensure that any customers activating those old versions can continue to use their software, we issued a serial number directly to those customers. While this might be interpreted as Adobe giving away software for free, we did it to help our customers.