Install 64BitThreeArch.iss again.

setup.iss

@@ -147,6 +147,7 @@ Source: "Examples\Example2.iss"; DestDir: "{app}\Examples"; Flags: ignoreversion
 Source: "Examples\Example3.iss"; DestDir: "{app}\Examples"; Flags: ignoreversion touch
 Source: "Examples\64Bit.iss"; DestDir: "{app}\Examples"; Flags: ignoreversion touch
 Source: "Examples\64BitTwoArch.iss"; DestDir: "{app}\Examples"; Flags: ignoreversion touch
+Source: "Examples\64BitThreeArch.iss"; DestDir: "{app}\Examples"; Flags: ignoreversion touch
 Source: "Examples\Components.iss"; DestDir: "{app}\Examples"; Flags: ignoreversion touch
 Source: "Examples\Languages.iss"; DestDir: "{app}\Examples"; Flags: ignoreversion touch
 Source: "Examples\MyProg.exe"; DestDir: "{app}\Examples"; Flags: ignoreversion signonce touch