The search term is currently a minefield of misinformation. The genuine project you should watch is RPCSX ( github.com/RPCSX/rpcsx ). Everything else labeled "PCSX4" is almost certainly fake, malicious, or abandonware.

: Some unofficial GitHub clones of PCSX4 have been found to host "PDIX extractors" that allegedly help you get files from your PS4, but in reality, they may be designed to steal your Console ID (PSID) and other sensitive account data. Telltale Signs of the PCSX4 Scam Reddit·r/emulationhttps://www.reddit.com

The name "PCSX4" implies a lineage from PCSX, PCSX2, and PCSX3 (a defunct PS3 emulator project). However, the PCSX2 team (the most successful Sony emulator) has publicly distanced themselves from PCSX4.