  We present the {\tt KKMCee 5.00.2} Monte Carlo event generator for lepton and
quark pair production for the high energy electron-positron annihilation
process. It is still the most sophisticated event generator for such processes.
Its entire source code is re-written in the modern C++ language. It reproduces
all features of the older \kkmc\ code in Fortran 77. However, a number of
improvements in the Monte Carlo algorithm are also implemented. Most
importantly, it is intended to be a starting point for the future improvements,
which will be mandatory for the future high precision lepton collider projects.
As in the older version, in addition to higher order QED corrections, it
includes so-called \order{\alpha^{1.5}} genuine weak corrections using a
version of the classic {\tt DIZET} library and polarized $\tau$ decays using
{\tt TAUOLA} program. Both {\tt DIZET} and {\tt TAUOLA} external libraries are
still in Fortran 77. In addition, a {\tt HEPMC3} interface to other MC
programs, like parton showers and detector simulation, replaces the older {\tt
HepEvt} interface. The {\tt HEPMC3} interface is also exploited in the
implementation of the additional photon final state emissions in $\tau$ decays
using an external {\tt PHOTOS} library rewritten in C.
