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Steps to reproduces:
1. Create an empty Unified iOS project
2. Try to add Google Analytics 18.104.22.168 component from Xamarin Component Store
"Error downloading component: Cannot find central directory"
INFO: Did not find manifest for component googleanalytics-22.214.171.124, reinstalling it
DEBUG: Download cache: Getting 'googleanalytics-126.96.36.199.info'
DEBUG: Download cache: 'googleanalytics-188.8.131.52.info' already downloaded
DEBUG: Component 'googleanalytics' entered state 'Resolved' (was: Unresolved)
DEBUG: Download cache: Getting 'googleanalytics-184.108.40.206.png'
DEBUG: Download cache: 'googleanalytics-220.127.116.11.png' already downloaded
DEBUG: Component 'googleanalytics' entered state 'ResolvedWithIcon' (was: Resolved)
DEBUG: Solution component cache: getting 'googleanalytics-18.104.22.168'
DEBUG: Solution component cache: fetching 'googleanalytics-22.214.171.124' from downloader
DEBUG: Download cache: Getting 'googleanalytics-126.96.36.199.xam'
DEBUG: Download cache: 'googleanalytics-188.8.131.52.xam' already downloaded
DEBUG: Component 'googleanalytics' entered state 'Unpacked' (was: ResolvedWithIcon)
ERROR: Component 'googleanalytics' entered state 'DownloadError' (was: Unpacked) [[ ICSharpCode.SharpZipLib.Zip.ZipException: Cannot find central directory
at ICSharpCode.SharpZipLib.Zip.ZipFile.ReadEntries () [0x0029c] in /private/tmp/source-mono-mac-3.12.0-branch-32/bockbuild-mono-3.12.0-branch/profiles/mono-mac-xamarin/build-root/mono-3.12.0/mcs/class/ICSharpCode.SharpZipLib/ICSharpCode.SharpZipLib/Zip/ZipFile.cs:407
at ICSharpCode.SharpZipLib.Zip.ZipFile..ctor (System.String name) [0x00020] in /private/tmp/source-mono-mac-3.12.0-branch-32/bockbuild-mono-3.12.0-branch/profiles/mono-mac-xamarin/build-root/mono-3.12.0/mcs/class/ICSharpCode.SharpZipLib/ICSharpCode.SharpZipLib/Zip/ZipFile.cs:226 ]]
Version 5.7.1 (build 17)
Mono 3.12.0 ((detached/de2f33f)
GTK+ 2.24.23 (Raleigh theme)
Package version: 312000076
Apple Developer Tools
Xcode 6.1.1 (6611)
Version: 184.108.40.206 (Business Edition)
Build date: 2015-02-11 04:37:05-0500
Looks like there is a problem unzipping the component's zip file. Possibly it was not downloaded fully. Can you find the googleanalytics-220.127.116.11.xam file in the directory ~/Library/Caches/Xamarin/Components, rename this file and then try the install again.
Marking as resolved as the customer reported that Matt's answer worked to resole this issue.