Based on your search for here is the relevant information regarding what it is, where to get it, and the current status of the project.
Phoenix OS is an Android-based operating system for x86 (PC) hardware. The "Lite" versions, often created by third-party modders like Phoenix LiteOS phoenix os lite 64 bit
You can find archived ISO files of Phoenix OS 64-bit here. Search for "Phoenix OS ISO" to find historical versions. Based on your search for here is the