public static void Initialize() {
Debug.Assert(Instance == null);
PreviousVersion = ValuesStorage.GetString(KeyPreviousVersion);
if (PreviousVersion?.IsVersionOlderThan(BuildInformation.AppVersion) == true) {
JustUpdated = true;
ValuesStorage.Set(KeyPreviousVersion, BuildInformation.AppVersion);
}
Instance = new AppUpdater();
}