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RenderMan for Houdini versions 24.2 and later come installed with a packages directory. Copy the packages json file to one of the following locations for Houdini to find on startup. Advanced package instructions by SideFX are here.
$HOUDINI_USER_PREF_DIR/packages
$HFS/packages
$HSITE/houdinimajor.minor/packages
(for example,$HSITE/houdini19.0/packages
)$HOUDINI_PACKAGE_DIR
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