It looks as though the default download filenames for all three versions of V4 are the same. So be careful about downloading so that you don't accidentally overwrite the old version. (You do keep backups, I hope.) Since DAZ have suspended access to the download until they resolve "issues" with the installer, I expect more confusing. I can't say any of this improves their image. And if you've an addon which uses the .obj file as a key to an encoded version, expect the old V3 problem of hidden changes to break things again.