: Ensure the bit-version (x86 vs x64) of the proofing tool matches your Office installation exactly. If it matches and still fails, repair your Office installation via the Windows Control Panel ( Programs and Features > Microsoft Office 2016 > Change > Quick Repair ). Issue 2: Text Switches Back to English Natively
Select or pt-pt from the language dropdown menu. Click Download . Choose the file that matches your architecture: Select proofingtools_pt-pt-x86.exe for 32-bit systems. Select proofingtools_pt-pt-x64.exe for 64-bit systems. Step 3: Install the Package Close all open Office 2016 applications. Run the downloaded .exe file.
Once the installation is complete, you must tell Word to actually use it.
While Office 2016 often includes a language interface pack, the "proofing tools" are the specific backend files that allow Word, Outlook, and PowerPoint to correct your writing.
If your document is still checking for English, you may need to manually set the language for the text.
Sometimes Office 2016 comes with the proofing tools pre-installed, but they are corrupted or disabled.
