please fix my problem 
Downloading Android SDK Platform-tools, revision 26.0.2
Download finished with wrong checksum. Expected 685bb47f28db4c739b1815be3155af1974929ea6, got 61ca26461d4caec6cbbef513891fcd04a4fcf52.
Done. Nothing was installed.
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Sdk platform 26.0.2 not installing
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