You need to get the SETool2 Lite v1.11 form somewhere(just search a bit using any search engine like google, yahoo, etc.). Then download my tool from here Remove SIM-lock patch generator, and follow that tutorial.
Or better, search on this forum, and you will get an download link...
Edit:
In How to apply patches with SETool2 Lite V1.11thread the first line give you a link:
Download SETool 2 Lite V1.11 From here: RapidShare: 1-Click Webhosting