All official downloads for the Gracenote Entourage SDK v2.4.1.4018 are invalid/incomplete ZIP files, and are unusable.
$ unzip -t gn-acr-android-2.4.1.4018.zip
Archive: gn-acr-android-2.4.1.4018.zip
End-of-central-directory signature not found. Either this file is not
a zipfile, or it constitutes one disk of a multi-part archive. In the
latter case the central directory and zipfile comment will be found on
the last disk(s) of this archive.
unzip: cannot find zipfile directory in one of gn-acr-android-2.4.1.4018.zip or
gn-acr-android-2.4.1.4018.zip.zip, and cannot find gn-acr-android-2.4.1.4018.zip.ZIP, period.
This means all the downloads posted at the official download page (https://developer.gracenote.com/entourage) for Android, C/C++, iOS, and Windows Phone 8 are unusuable.
How may I access SDK's for "Android" and "C/C++" platforms?
(for the record: Windows RT, which I'm not interested in ATM, has an older release posted—2.3.1—which is a usable zip file.)
Note: I've already attempted to re-download the SDK's from completely different devices, over completely independent network connections: the resulting files are the same—invalid.
For anyone else who was trying to acquire the Entourage SDK within the last month:
It took a while, but the files uploaded a month ago were finally confirmed by Gracenote as invalid. They have now uploaded new, working zip files. Just download the SDK again.
@WYH Thanks Wai-Yu! I've re-downloaded the Android and C/C++ SDK's, and they both at least can be successfully unzipped now. I'll let you know if anything else comes up.