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I have an issue updating the android SDK tools rev 19 to rev 20 & Android SDK Platform-tool rev 11 to rev 12.
I checked the SDK manager log and it displayed the below error:
File not found: C:\Program Files (x86)\Android\android-sdk\temp\platform-tools_r12-windows.zip (Access is denied)
Skipping 'Android SDK Tools, revision 20'; it depends on 'Android SDK Platform-tools, revision 12' which was not installed.
Done. Nothing was installed.