This happens now and then, and it's known as the [XY Problem][1].

This user is asking for a solution which will not solve his initial problem. Instead, he could have asked "How do I by-pass the download limit?".

As long as you point out that the solution the OP is looking for will not solve OP's *real* problem, and offer an alternative solution instead, then it should be fine.

 - [Alternative instead of real answer][2]
 - [If I solve someones problem instead of answering their question,
   should I post a comment instead?][3]

Is there a risk for your answer being flagged as "not an answer"? According this [answer][4], (from the discussion "[When should the “Not an Answer” flag be used?][5]", no:

> A bad or a wrong answer is still technically an answer. Moderators
> aren't here to judge the correctness of answers. That's what the
> voting system is for, so the right way to handle those is to downvote,
> edit, or leave a comment.




  [1]: http://meta.stackexchange.com/questions/66377/what-is-the-xy-problem
  [2]: http://meta.stackexchange.com/questions/122998/alternative-instead-of-real-answer?lq=1
  [3]: http://meta.stackexchange.com/questions/101714/if-i-solve-someones-problem-instead-of-answering-their-question-should-i-post-a
  [4]: http://meta.stackexchange.com/a/107218/135240
  [5]: http://meta.stackexchange.com/questions/107216/when-should-the-not-an-answer-flag-be-used?rq=1