OLS2OWL require the installation of Protégé 4.0

  1. Download the latest version of ols2owl from Here.
  2. Extract the zip file in the plugins directory under your Protégé 4.0 installation folder.
  3. To initialize ols2owl, first open Protégé, then go to tabs and select ols2owl.
  4. You are ready to go.