Mon Dec 11 2017 00:10:37 UTC
If an infinite amount of monkeys were to write code, one would make the same mistake like you did.
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ID Product Comp Assignee Status Resolution Summary Changed
57798 Xamarin Android sevoku CONF --- SDK Manager reports Android Emulator not installed 2017-09-15
One bug found.

as

File a new bug in the "Android SDK Manager" component of the "Xamarin Studio" product