Nothing was masquerading as anything. Download the full 0.5 version for Act I and it works fine.Looks like there was more 0.4.7 than 0.5 in my alleged 0.5 download. When I went to combat the mimic, combat crashed on an unknown enemy (mimic was actually labeled as a v48trapper). So I just trashed it all and went with the act 1 compressed download instead. That let me pick up from an autosave and get into the combat after I had decompiled the bytecode and enabled the console to get my investigation done.
I saw a couple of messages in here from people wondering why they didn't manage to get prompted to save for act 1. They may either have run into my old version problem or a similar old version masquerading as 0.5 thing.