Poser 4.0.1 only ever existed in localized versions. The initial US Poser was 4.0 but - despite many bugs - they didn't release a quick bugfix, but rushed to do the foreign versions first. About 3-4 months later they released a pretty stable 4.0.1 in Germany (and probably France) and then they quit business... :-( Around christmas time Larry Weinberg at Ghost Effects picked up the source code and started to release the legendary "unofficial patches", where version counting started with 4.0.2b-something. When it was finally finished, I think it was only the US version that got final, but then they released a final 4.0.3 in both English and localized languages (but the only difference to the final 4.0.2 seems to be the network serial check and the new CL logo). Version 4.0.1 is technically (and "bug-nically") close to the final 4.0.2/3.