When you receive a download error message, if you click Cancel instead of Finish, Android Studio will still be open. That was for me. Then you can enter the SDK manager and install the necessary components.
But if you still can’t get into Android Studio, you can still access the SDK manager GUI by going to the directory where sdk is located (the name of the directory will be something like adt-bund-mac-x86 or android- sdk- macosx), in the tools folder, run the android executable. Mac OS does not want to start it automatically because it is not signed as a reputable developer, but you can start it by right-clicking and selecting "Open." This launches the SDK manager, and you should be able to install everything you need there.
paralith
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