Hi Kees,
I didn't install the s-by-s files to see if there is a bug in the sample files themselves ... but generally here is what I have observed: If you cannot edit any fields, then the layers that the objects are on are either locked or hidden. If you can edit some fields but not others, then the objects are not 'compatible' ... that is, either some of the objects do not have the field that you are trying to edit, or they have the field but use a different variable name for it (usually happens when combining old parts with new parts).
HTH. If not, and nobody else jumps in, I'll install the files and see what's going on.
Karl
AC 28 USA and earlier • macOS Sequoia 15.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB
One of the forum moderators