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While building, if the build is cancelled while xamarin is dowloading a java source zip file, on next build it displays 'unzipping failed'.
Xamarin downloads a zip file when the project references the Google Cast or Google Analytics component for example.
Checking the C:\Users\(windows user)\AppData\Local\Xamarin\zips folder, you can find invalid zip files.
If you delete them and build again without cancelling, it works ok at the end of the download.
The build process should delete invalid zip files when building the app again.
In a future release of Xamarin.Android, the build process will automatically pause and resume the download as appropriate:
*** This bug has been marked as a duplicate of bug 41123 ***