You shouldn’t be downloading anything, you should be ripping your legally purchased discs yourself per community rules.

MakeMKV is pretty widely used for Blu-Ray ripping IIRC, and I believe it’s free. External USB Blu-Ray drives aren’t too pricey if you don’t already have a drive that can read a BR disc to rip.

If all you have is DVDs, that can work, but usually working with BR sources is easier since you don’t have to worry about framerate conversations/deinterlacing (except maybe for some of the deleted scenes).