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Here's a list of common problems and questions as well as a few ideas on how to solve these issues. Before you post a new thread, make sure to check here along with the other stickied threads for a solution to your problem.
If you'd like to search directly for your issue, or want to see a complete list of common problems start with the Knowledge Base
If you don't see your issue, or the solutions here don't work, feel free to post in the forums for the helpful and well-tooled Wrenchmen, fellow players and occasional Riot Support Staff. Make sure to Attach any relevant files to your post.
Important! Whenever you test out a fix, you should always join a practice game, this lets you avoid being flagged by LeaverBuster if it doesn't work.
Remember this is all to help you help yourself, if you'd like additional support, please open at ticket at http://support.leagueoflegends.com/ or post a thread in the Help and Support Forums.
Getting Started - Setup and Install
Where do I download this game?
2. Please make sure you select the regional client you wish to use (Europe-West , Europe-Nordic & East or North America)
3. If the first link or Pando is giving you trouble, Use these links: