The theatrical cut has been released on Blu Ray in Australia and Germany but apparently the quality is rather poor, yet still the best official release thus far.
Australian - https://www.blu-ray.com/movies/Robin-Hood-Prince-of-Thieves-Blu-ray/244531/
German - https://www.blu-ray.com/movies/Robin-Hood-Prince-of-Thieves-Blu-ray/254151/