encode
When checking for updates(Help | Check for Updates...), encode the Devart authentication login field. This way email addresses containing a plus(+) will not fail.
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Jim commented
What I meant was to use Uri.EscapeDataString(login) when you call the fileupdatehandler so your querystring is well formed. It thinks the plus(+) in my email is a space and it should encode it to %2b instead.