LDCad 1.6a (win+linux)

[Roland Melkert]

That package contains shadow.sf which is the seed for snapping info.

Yes. I can look into them on filesystem - like into any other zip file. And I see that shadow.cf contains 24299.dat file with the snap definition I'd expect (two antistuds at part bottom). But after I put all these .sf files into seeds/ subdirectory and start LdCAD, I see no antistuds there for part 24299. Checked with "show snap info" function (F12).
Is there any special action I need to do? Or LdCAD setting?

I expect that it starts to work when I extract .csl file from the .sf file manually and put it into shadow/ directory (replace the old/original version of the same file). But why it does not work with seeds/ directly?

The .sf only updates the .csl, but it seems you are using the shadow library unpacked. If so you'll need to manually unpack the updated csl again. It's probably better to first delete the old unpacked folder as I have deleted some files because those parts who have been moved/renamed in the new library (~moved in description)