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When in ArcCatalog > Help > ArcGIS Desktop Help > Index tab > an error message appears:
"AppName: arccatalog.exe AppVer: 18.104.22.1685 ModName: itircl.dll
ModVer: 5.2.3790.80 Offset: 0000800a"
and this is followed by the application crashing.
This is a known issue.
Follow the commands listed below to register the file itircl.dll: