  We present the C++ code BSMPT v2 which is an extension of the previous code
BSMPT for the calculation of the strength of the electroweak phase transition
in extended Higgs sectors. The new version BSMPT v2 includes the features of
BSMPT and extends the already implemented models (the 2-Higgs-Doublet model
(2HDM) in its CP-conserving and CP-violating versions and the Next-to-2HDM) by
the Complex Singlet Extension of the Standard Model (CxSM). The major upgrade
is the implementation of the computation of the baryon asymmetry of the
Universe (at present for the C2HDM) in two different approximation, called the
FH and the VIA approach. Furthermore, the possibility of varying the
renormalisation scale in the loop-corrected effective potential has been added.
These changes and further smaller modifications are described in this manual.
Additionally, a detailed explanation of the procedure for the implementation of
new models is given, which has also changed with respect to the previous
version.
