Architecture mismatch. You have 32-bit Office but downloaded a 64-bit language pack. Fix: Uninstall the language pack, download the correct architecture version. (Most home users have 32-bit Office).
Add an editing or authoring language or set language preferences in Office
about the Microsoft Office 2013 Thai Language Pack (e.g., its features, installation, compatibility, or importance for Thai users), please confirm, and I will write that for you.
Installation typically requires the base version of Office 2013 to be already present on the system. Office 2013 Thai Language Pack _best_
: It is recommended to install the Service Pack 1 (SP1) for the Office 2013 Language Pack to ensure the best stability, security, and performance.
