If you use a download accelerator to unzip files,some sites will not allow you to use the accelerator as it corrupts their files. If you use a accelerator and wonder why the files won't download that is why. I don't know how to enable the accelerator to use the normal zip downloder Maybe someone knows how to do that
I'm not familiar with any program by the name of, "Download Accelerator." But it is worth mentioning that WinZip is the recommended program for opening .zip files. It can be downloaded for free.