Here's a selection of blu-ray rips (HD) of various movies for free download from archive.org - feel free to add any more below, but only if they're HD. No DVD or VHS rips.

https://archive.org/details/2001-a-space-odyssey-1968_202407
https://archive.org/details/the-cincinnati-kid-1965
https://archive.org/details/dawn-of-the-dead-complete-cut-1978-highest-quality-1080p-blu-ray-1080p-24fps-h-264-128kbit-aac
https://archive.org/details/dead-poets-society-1989-1080p-blu-ray-x-264-aac-ozlem_202402
https://archive.org/details/the-abominable-dr.-phibes-1971_202502
https://archive.org/details/dr.-phibes-rises-again-1972
https://archive.org/details/dr-terrors-house-of-horros-1964
https://archive.org/details/frosty.the.-snowman.-1969.1080p.-blu-ray.-h-264.-aac-rarbg
https://archive.org/details/get-the-gringo.-title-800
https://archive.org/details/the-hunter-1980
https://archive.org/details/i-robot-2004-open-matte-sdr-ds-4-k-1080p-ai-blu-ray-rip-hindi-vcd-dd-2.0-english-ddp-5.1-peru-guy
https://archive.org/details/the-life-and-times-of-judge-roy-bean-1972
https://archive.org/details/the.-little.-drummer.-boy.-1968.1080p.-blu-ray.-h-264.-aac-rarbg
https://archive.org/details/mad.-max.-1979.1080p.-blu-ray.x-265-rarbg
https://archive.org/details/the-mechanic-1976
https://archive.org/details/MKTheJourneyBeginsBluRay
https://archive.org/details/play-misty-for-me-1971_202502
https://archive.org/details/road-house.-title-2_202407
https://archive.org/details/rolling-thunder-1977
https://archive.org/details/runaway-1984_202501
https://archive.org/details/white-lightning-1973