Good to hear Yener! OpenSource is a good thing
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I'm currently working on something that I've wanted for a long time, and I hope many people will find it useful (hopefully it'll be done soon and I can put up my first project here!). While I haven't borrowed any code from your Script, I used your script when I first started writing my own just to see what all was going on internally to get the desired output.
On a related note; I think you'll find that on sites like these, even though it's not acknowledged/encouraged, a great deal of the users are starting with pirated material to begin with. Unfortunately these types of people aren't usually big on giving credit where credit is due, there's almost a sense of entitlement. The hard-work people put into the games themselves isn't even appreciated by paying for it. So one can hardly expect a script written for a custom installer to receive a simple thank you in the form of acknowledgement. I could be completely off the mark with my assessment, but I would be surprised if so.
Just remember that those of us who know the required time and effort it takes to put a script together greatly appreciate it, even if some people take it for granted!