Open any Office app (like Word), go to File > Account > About Word , and check if you are using the 32-bit or 64-bit version. Download the Correct File:
Microsoft Office 2013 Thai Language Pack (also known as a Language Accessory Pack) allows you to localize your Office experience by changing the display interface, help documentation, and proofing tools (spellcheck and grammar) to Thai. Microsoft Support Core Features Localized Interface office 2013 thai language pack top