While "free download" links for paid games can be tempting, there are a few important things to keep in mind regarding that specific version and source:

If you are looking for a way to play with friends safely, the official version is the only way to access the full multiplayer experience.

It sounds like you might be referencing a specific post or website offering a free download of (version 0.7.1.3).

Since Phasmophobia relies on official Steam servers for its co-op gameplay, "free" versions usually cannot connect to official lobbies. You would miss out on the core experience of playing with others and the frequent new ghosts and maps added by the developers.