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The H-COUP program is provided as a package of Fortran codes, which cancompute observables related to Higgs bosons including radiative corrections invarious extended Higgs sectors. We give a manual for the latest version ofH-COUP (H-COUP_3.0), in which decay rates and branching ratios of all the Higgsbosons can be calculated at one-loop level in EW and Higgs interactions withQCD corrections in the Higgs singlet model, four types of the two Higgs doubletmodel with a softly-broken $Z_2$ symmetry, and the inert doublet model. Theprevious version (H-COUP_2.0) can evaluate those only for the standard modellike Higgs boson with the mass of 125 GeV ($h$). In H-COUP_3.0, renormalizedquantities are computed based on the gauge independent on-shell renormalizationscheme. The source code of H-COUP_3.0 can be downloaded via the following link:\url{http://www-het.phys.sci.osaka-u.ac.jp/~hcoup}. By using H-COUP_3.0, we cancompare the precise measurements of the properties of $h$ and direct searchesfor additional Higgs bosons with their predictions at one-loop level, by whichwe can reconstruct the structure of the Higgs sector.

H-COUP Version 3: A program for one-loop corrected decays of any Higgs bosons in non-minimal Higgs models