Changed a critical error to a non-critical one when dealing with the strange .CopyFile flag in common/download.go.

common/download.go

@@ -155,12 +155,12 @@ func (d *DownloadClient) Get() (string, error) {
 
 	remote, ok := d.downloader.(RemoteDownloader)
 	if !ok {
-		return "", fmt.Errorf("Unable to treat uri scheme %s as a Downloader : %T", u.Scheme, d.downloader)
+		return "", fmt.Errorf("Unable to treat uri scheme %s as a Downloader. : %T", u.Scheme, d.downloader)
 	}
 
 	local, ok := d.downloader.(LocalDownloader)
 	if !ok && !d.config.CopyFile {
-		return "", fmt.Errorf("Not allowed to use uri scheme %s in no copy file mode : %T", u.Scheme, d.downloader)
+		d.config.CopyFile = true
 	}
 
 	// If we're copying the file, then just use the actual downloader