如何使用TDownLoadURL处理下载失败或无效的URL链接或Internet故障等异常？

I have an VCL app containing an object TDownloadUrl (VCL.ExtActns) used to download applications, my question is how to handle any kind of exception that restrict to download [for example:- like download failed or invalid URL link or internet failure or url not reachable or internet not available] using TDownLoadURL?.I have an VCL app containing an object TDownloa