To compile and get the latest version of the software:

mkdir LHCbMasterclass && cd LHCbMasterclass
curl https://gitlab.cern.ch/LHCbOutreach/LHCbMasterclass/-/archive/v2.0/LHCbMasterclass-v2.0.tar.gz  | tar -xz
cmake .
make 

By default the exercise downloads and allows browsing 32 different data files.
To change with number to n (with n<=175, as this is the maximum available), you can run:

mkdir LHCbMasterclass && cd LHCbMasterclass
curl https://gitlab.cern.ch/LHCbOutreach/LHCbMasterclass/-/archive/v2.0/LHCbMasterclass-v2.0.tar.gz  | tar -xz
cmake -DNB_DATA_FILES=n .
make

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cmake can be loaded from http://www.cmake.org/cmake/resources/software.html