}
            }

            // Perform the update based on the downloaded file
            return UpdateFromFile(ZipFile);
        }

        public int UpdateFromFile(string zipFile)
        {
            if (zipFile == null)
                throw new ArgumentNullException(nameof(zipFile));

            int NumFiles = 0;
            Log($"Extracting files...");
            using (var Zip = ZipFile.OpenRead(zipFile))
            {
                foreach (var Entry in Zip.Entries)
                {
                    var TargetFile = new FileInfo(Path.Combine(ZTreeHome, Entry.FullName.Replace('/', '\\')));
                    if (TargetFile.Exists)
                    {
                        if (Identical(Entry, TargetFile))
                        {
                            Log($"\t{Entry.FullName}\tidentical to existing file; skipping.");
                            continue;
                        }

                        // Try moving to version-based folder first; only if that doesn't work, try to rename
                        //  to a version-based file name in the same folder.
                        Log($"\t{Entry.FullName}\tbacking up existing file.");
                        try
                        {
                            var BackupName = VersionBasedFolder(TargetFile);
                            try
                            {
                                File.Move(TargetFile.FullName, BackupName);
                                TargetFile.Refresh();
                                if (TargetFile.Exists)
                                    // Then, the move was NOT successful
                                    throw new Exception("Unable to move the file.");
                            }
                            catch (Exception ex)
                            {
                                Log($"\t{Entry.FullName}\tFirst attempt: {ex.Message.Trim()}");
                                BackupName = VersionBasedFilename(TargetFile);
                                File.Move(TargetFile.FullName, BackupName);
                            }
                        }
                        catch (Exception ex)
                        {
                            Log($"\t{Entry.FullName}\tBackup failed: {ex.Message.Trim()}", TraceLevel.Warning);
                        }
                    }

                    Log($"\t{Entry.FullName}\textracting...");
                    Entry.ExtractToFile(TargetFile.FullName);
                    NumFiles++;
                }
            }
            return NumFiles;
        }

        private string VersionBasedFolder(FileInfo File)
        {
            var SourceDir = new DirectoryInfo(ZTreeHome);

                }
                Text = Text.Substring(0, Match.Index) + Replacement + Text.Substring(Match.Index + Match.Length);
                StartAt = Match.Index + Replacement.Length;
            }

            return Text;
        }

    }

}