Here's the download link (not aff link):
PDFTiger Time-limited Giveaway
It says on the website:
"This PDFTiger Time-limited Giveaway Promotion will be CLOSED on Oct 21, 2010."
Remember to register with the code provided BEFORE 21st Oct or else I guess there would be a limit for conversion (saw one before I registered). Now go download and enjoy it
p/s: registration code on download page.