Innosetup multi-language settings

[Setup]
ShowLanguageDialog=yes
ShowUndisplayableLanguages=yes

[Language]
Name: "english"; MessagesFile: "client\\Setup Language\English.isl";LicenseFile: "client\License\ENGLICENSE.txt"
Name: "chinese"; MessagesFile: "client\\Setup Language\Default.isl" ;LicenseFile: "client\License\CHILICENSE.txt"
Name: "chinesetra"; MessagesFile: "client\\Setup Language\ChineseTrad.isl" ;LicenseFile: "client\License\TAILICENSE.txt"

Did not add ShowUndisplayableLanguages = yes before the three language pack shows only two, always thought it was a script issue.
After a search found Innosetup will be able to support the language pack according to machine language.