Mike Karpenko and similar trainers often post updated "XT-style" workouts on YouTube for free. These are legal, high-quality, and require no torrenting.
Tapout XT is copyrighted material. Depending on your region, ISP monitoring can lead to copyright infringement notices or fines.
Many legacy programs are now available on official fitness apps for a low monthly fee. This provides instant access to the entire library in 4K without taking up hard drive space.