Those forums are English only, and the original place where you posted was wrong (the bug forum is about bugs with Construct 2 and needs you to follow the report guidelines).
For your license follow the manual article about using a license.
If this still doesn't help you get your license to work, consider sending an email to support (at) Scirra.com with a copy of your c2license.txt file and your transaction ID or Scirra payment reference as proof you are the genuine license owner.
From now on please post in English in those forums or at least provide an English version with all your messages.