As soon as you download the zip file from our website, please right click on the file, select Properties and then, Click the Unblock button.

If you don't do so, visual studio will throw Build Error. If you don't see the Unblock button from Properties dialog, then perhaps, your operating system has already got it unblocked.

If you did not UNBLOCK the Zip file after downloading from internet, please Unblock the zip file now and then unzip again.  

Also, you will find the API Documentation.chm will show empty pages, if you do not right click on that file and choose to Unblock.
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