You cannot get the full pack for free, but you can get about for free through strategic downloads.
Everything You Need to Know About VisuStella MZ Plugins and Free Content visustella mz plugins full free
Because VisuStella is a business. The team spends thousands of hours coding, debugging, and documenting. The paid plugins fund the maintenance of the free ones. If everyone got the "full" pack for free, the project would collapse. You cannot get the full pack for free,