The naming convention [ProjectName]-DEMO.[Version]-[Platform].zip is typical for developers sharing progress updates with community testers or patrons.
Do you have the or the developer's name for this specific "AllAbout" project? A Simple Life with My Unobtrusive Girl by NLCH AllAbout-DEMO.0.3-pc.zip
Before opening, run the file through a reputable multi-engine scanner like VirusTotal to check for potential threats. The naming convention [ProjectName]-DEMO