Perhaps I'm just a dummy, but after days and hours I could not find some of the tpl files that needed to be edited. So after my findings and with everything working just awesome I decided to modify the instructions a little...
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Install Instructions
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1. Place the namespinner.tpl file in your /whmcs/templates/ "Not in the template you are using"
2. Change $maxspins variable to adjust number of suggested names
3. Change $showdotcom, $showdotnet, $showdotcc, $showdottv, $sensitivecontent to your liking
4. You can setup multiple sorts using the $sort1, $sort2, $sort1order, $sort2order variables.
4B. In the templates/orderforms/ "Template you are using for your ordering"
5. In adddomain.tpl add the line: {include file="namespinner.tpl"} directly before the last </form> tag
6. In configureproductdomain.tpl add the line: {include file="namespinner.tpl"} directly before the last </form> tag
7. In the domainchecker.tpl add the line: {include file="namespinner.tpl} directly before the last </form> tag
8. Block tpl access from the web (http://forum.whmcs.com/showthread.php?t=18709)