/usr/share/hyphy/UserAddins/OldAddins/ is in hyphy-common 2.2.6+dfsg-3build3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/hyphy/UserAddins/OldAddins/AAMutationCounter
/usr/share/hyphy/UserAddins/OldAddins/CodonMutationToTreeMapper.bf
/usr/share/hyphy/UserAddins/OldAddins/ColorPSTree
/usr/share/hyphy/UserAddins/OldAddins/ConvergentAndParallel
/usr/share/hyphy/UserAddins/OldAddins/CopyBranchLengths
/usr/share/hyphy/UserAddins/OldAddins/DashPSTree
/usr/share/hyphy/UserAddins/OldAddins/ExpsPerDirection
/usr/share/hyphy/UserAddins/OldAddins/FilterAssignments
/usr/share/hyphy/UserAddins/OldAddins/InferredAASubstitutionsCounter
/usr/share/hyphy/UserAddins/OldAddins/LocaldNdS
/usr/share/hyphy/UserAddins/OldAddins/ModelFitSummary
/usr/share/hyphy/UserAddins/OldAddins/ModelFitSummaryAA
/usr/share/hyphy/UserAddins/OldAddins/Multiclass DN DS inference
/usr/share/hyphy/UserAddins/OldAddins/PartitionBranchesByClasses
/usr/share/hyphy/UserAddins/OldAddins/PredictivePosteriorP
/usr/share/hyphy/UserAddins/OldAddins/RNARateMatrix
/usr/share/hyphy/UserAddins/OldAddins/SimulateAndTabDN_DS
/usr/share/hyphy/UserAddins/OldAddins/SimulateFromLF
/usr/share/hyphy/UserAddins/OldAddins/TreeLengthConstraint
/usr/share/hyphy/UserAddins/OldAddins/dNanddSTrees.bf
/usr/share/hyphy/UserAddins/OldAddins/dS and dN factors