The modern way to watch 3D movies is via Virtual Reality. Apps like and Skybox VR allow you to play your legally owned 3D Blu-ray rips (made via MakeMKV) in a virtual cinema. Furthermore, services like Vudu (Fandango at Home) still sell digital 3D movies.
While the site doesn't ask for your credit card upfront, downloading files from unverified piracy networks carries massive risks to your hardware, privacy, and digital security: Malware and Viruses: worldfree4com 3d movies free