Many premium services allow high-definition downloads for offline viewing during their trial periods.
Some streaming services offer free trials, during which you can download movies for offline viewing. While not traditional downloads, these services provide legal and high-quality content. How To Download Free Bluray Movies 1080p -
If you already own physical Blu-ray discs, you can create your own 1080p digital files for personal use. Note that while common, circumventing copy protection (DRM) is a legal gray area or technically illegal in some jurisdictions like the U.S. under the DMCA. How To Download Free Bluray Movies 1080p -