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This is a free educational version of Zbrush Core. It allows you to get used to the Zbrush UI without paying for it.
More or less, a transitional package to Zbrush or Zbrush Core.
It doesn't have all the features of Zbrush or Zbrush Core.
Con For Non-Commercial use only
Cannot sell any products you make using this software.
You'll have to upgrade your files to Zbrush Core or the standard Zbrush. Also will need License for either Zbrush Core or the Standard Zbrush depending on which one you upgrade to.