Spine assets should be exportable in the updated specific build, mentioned in the first post. Note that if you're exporting the whole folder, there will be texture duplicates (one from actual texture export and one from references in atlas) placed in different folders. Spine export was created in the way it would be compatible with most spine viewers, which expects for all related files to be present in the same folder.
@spiritovod I've been trying to get the spine assets, and I can't seem to find a way to the .atlas and .skel. I'm using umodel_acl_2.1, and anytime I try to export the files in the folder before the textures, nothing is exported, could you help me?