This is the most common point of confusion. The rule for Office language packs is simple but absolute:
Microsoft distributes variations of language updates depending on user needs: UI Translation Proofing Tools Main Use Case Changing primary display and workspace to English. Language Interface Pack (LIP)
How to Download and Install the Microsoft Office 2016 English Language Pack (64-bit) microsoft office 2016 english language pack 64-bit
The Ultimate Guide to Microsoft Office 2016 English Language Pack (64-Bit)
If you already have the pack but it’s buggy, check for official updates like This is the most common point of confusion
If it says “64-bit,” the is the correct choice. If it says “32-bit,” you must find the 32-bit version of the language pack instead.
Having both 32-bit and 64-bit components installed can cause issues. If it says “32-bit,” you must find the
2. Crucial Prerequisites: Matching Bit-Version and Architecture
Before downloading and installing a language pack, you must ensure it matches your current Office installation exactly. Mixing architectures or versions will cause the installation to fail. 1. The 64-Bit Architecture Requirement
Standardizing localized regional languages over a base language.