If you work with other developers, you can purchase a commercial license and share it internally (check the EULA – most VisuStella licenses allow use by a single team/company, not individual resale).
VisuStella MZ plugins have no officially free feature set.
They are commercial. If you saw a "free" download, it is either unofficial, a trial-limited demo, or a scam. visustella mz plugins free
If you'd like a recommended list of fully free MZ plugin collections (Galv, HimeWorks, Yanfly MV + FOSSIL, SRDude, etc.), I can provide that separately. Let me know. If you work with other developers, you can
On the RPG Maker Web forums, user Caethyril has released dozens of small, focused MZ plugins for free, covering message windows, movement routes, and skill formulas. VisuStella MZ plugins have no officially free feature set