Hi @AWeiPan ,
Thank you for using InstallBuilder. Can you give us more information about the issue you are facing?
Simplified Chinese is supported and you can use on your project using the defaultLanguage property of the project to set it
<project> ... <defaultLanguage>zh_CN</defaultLanguage> ... </project>
You can get more information on the supported languages in our website at https://clients.bitrock.com/installbuilder/docs/installbuilder-userguide/ar01s12.html