OK, here's the problem:

I had my old VHS home movies (mostly of my kids when they were small) converted to DVD. I now want to convert these yet again so I can edit, create clips etc, on my MacBook, perhaps on iMovie.

I searched on the Apple SUpport Forums and it seemed that HandBrake would do the trick, so I downloaded and installed it, slipped one of the DVD's into the drive and followed the instructions. Unfortunately, what I got was the following
error message:
HandBrake could not find a compatible version of libdvdcss (32-bit libdvdcss is not compatible with 64-bit HandBrake and vice-versa).
Followed by an option to download and install said software. When I tried doing that, I got another error message:
“libdvdcss.2.dylib” can’t be opened because it is from an unidentified developer.
and that MacOS would not allow the download.

What now? Has anyone here done this before? Do you know an easy way to do it, easy enough for a tech idiot who does not understand the jargon?

Thanks in advance!