Hi,
thank you for your post and for your support. You can find the version 5 in the following links.
http://fuzzylite.com/download/fuzzylite5-windows/
http://fuzzylite.com/download/fuzzylite5-linux64/
http://fuzzylite.com/download/fuzzylite5-mac/
If you are interested in a discount for version 6, please send an email to sales@fuzzylite.com.