Navigating around the BTABRAY website, you may come across .ISO files in "DVD" sections. How do you use these, you may ask? There are three primary methods to use these to watch your show offline.
.ISO files are discs in a file. You can burn .ISOs onto discs. This option is for if you're going anywhere and you still want your precious, precious whatever-it-is.
You are able to play .ISO files in a few media players, such as VLC Media Player. Simply navigate to the Open File menu and select the .ISO file. It was play as a DVD. This only works for .ISO files that are specifically DVDs or even CDs.