I had to send in my old Mac (10.11) for screen repair, and worked on a replacement MacBook with 10.14. Now, I'd like to transfer my data back from the replacement's Time Machine to the old Mac. I don't want Mojave because the very real downsides of breaking some pieces of software I rely on don't outweigh the cosmetic benefits.
Now, Migration Assistant tells me I cannot use my backup on the old Mac!
Is there a way to transfer only the data and leave the macOS untouched? User data and OS should really be separate.