  The Monte Carlo program \texttt{SUSYGEN}, initially designed for computing
distributions and generating events for supersymmetric particle production in
$e^+e^-$ collisions, has now been upgraded to study supersymmetric processes at
linear colliders by the inclusion of beamstrahlung, beam polarization, spin
correlations and complex couplings including CP violating phases. It continues
to offer, in the new context, the possibility to study the production and decay
of supersymmetric particles within the most general minimal standard
supersymmetric model (MSSM), the minimal supergravity model (MSUGRA) or the
gauge mediated supersymmetry breaking model (GMSB), with or without assuming
R-parity conservation.
