For some reason you need Android API 8 (Android SDK 8) in your project? here you can find it
Google deprecated this SDK for Mac and Windows, they hide the URL for downloading the SDK, becoming in a "SDK not available for Mac OS/Windows" error within Android studio.
Clone this repo, choose your platforms SDK folder (mac, windows or linux) and copy the contents to:
< Your SDK Location >/platforms/android-8
In a Mac with default settings, it would be ~/Library/Android/sdk/platforms/android-8
this SDK's revision is android-2.2_r02