I get many errors even the hello world does not work
@ShubhamTholiya close your solution and remove that file and extracted files. Open and rebuild the solution. it might take a little long but it should work.
its not working for me..
Delete the zip at \Local\Xamarin\zips\xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.zip
Now Clean and Rebuild your solution, It should work.
The following knowledge base article might also be helpful if repeating the automated download process does not succeed:
"How can I manually install the Android Support libraries required by the Xamarin.Android.Support packages?"
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