System.Net.WebClient has an UpdateFile and a DownloadFile method. As long as the server's cert is from a well-known Authority you shouldn't have a problem with an https url. If the cert isn't from a well-known Authority and the Authority isn't in the Trusted Authorities list or the cert isn't in the Trusted Publishers list you'll have to added in advance. WebClient has no UI, so it can't ask the user if the unknown cert is acceptable like IE does, so it just fails.
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