[SanjayMehta]

There are file converters. At least one big name company - probably Adobe - offered a free tool. I stopped using Adobe after LR went subscription, so can't remember the specifics.

[wvbdmp]

You can still use Adobe DNG Converter. I use it to convert new raw files for Lightroom 4.

[SanjayMehta]

That's the one, thanks. I have a Mac mini just for Aperture and LR5, will see if this can revive that system.

Problem is that the latest macs are just so fast that it makes it hard to switch back.

[wiredfool]

Me too. Mini has gone from main dev machine, to backup, to kids, and now to Lightroom. It wasn't a slouch BITD, 6 core and 32G ram. It's a bit slow now, but not that bad even on the 4k screen. But it's the best thing I have that runs 32 bit MacOs.