by JL on August 29, 2020 at 08:28
I bought the first version in the html format because the autor promised to update the book in the future. Most of the code did not work properly due to incompatibilities with the julia's packages and solvers. There were no updates of the book and the autor published this second version as a new book without acces to the purchasers of the first edition. So don't trust the words of the author about future updates.