Need help to fulfill my idea, thanks .[wordpress]

Hello webmasters need another help from you experts.

I want to design a wordpress seri@l key giveaway website.

My Idea.


You will get idea from above picture .

Example:
First I want to load about 10 seri@ls to my website.
When users with different IP click on claim button, key left number must decrease based on seri@l key claiming.

Is there any plugin to manage these kind of jobs.?

 

try the download manager plugin, it gives you a direct download link for your visitors