I downloaded the executable file from the web site Xamarin.com, but during the installation tool goes wrong.
Can anyone help me?
What OS are you using? I run Win 8 and had some issues as well but it was resolved when I ran the installer individually as admin. It actually took me a few hours to get up and running but I got there in the end.
Your installer logs should be around here: C:\Users\\AppData\Local\Xamarin\Universal it might give you some more info
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