To find the League Client:

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- The League Client must be opened

- The Call-Maker must have been launched with the same or greater rights than the League Client.

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If the League Client is running with administrator rights, the Call-Maker must be running with administrator rights too.

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Also the League Client mustn't be closed during the game!

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So please be sure the option Close client during game is disabled in the League Client settings under the tab Client/General.