public override IEnumerable<UpdateOption> GetUpdateOptions() {
Func<string, bool> uiFilter = x => x != @"ui_skin.json";
Func<string, bool> previewFilter = x => x != @"preview.jpg";
return base.GetUpdateOptions().Union(new[] {
new UpdateOption(ToolsStrings.ContentInstallation_KeepUiInformation){ Filter = uiFilter },
new UpdateOption(ToolsStrings.Installator_KeepSkinPreview){ Filter = previewFilter },
new UpdateOption(ToolsStrings.Installator_KeepUiInformationAndSkinPreview){ Filter = x => uiFilter(x) && previewFilter(x) }
});
}