Once the download finishes, to start the installation process.
: Translates all ribbon menus, button prompts, dialog boxes, and window alerts into Serbian.
After installation, you must tell Office to use Serbian as your primary language: and go to File > Options > Language . microsoft office 2016 language pack serbian
Microsoft provides Language Accessory Packs for Office 2016 as free downloads.
Select from the left-side menu in the Options window. Once the download finishes, to start the installation
This means that if your primary Office interface was set to another language like English, you could still spell-check, grammar-check, and use a thesaurus in Serbian (Latin). When you installed a primary language version of Office 2016, it automatically included proofing tools for a set of companion languages. For example, the Croatian version of Office included proofing support for Serbian (Latin). The Serbian (Latin) primary language itself, if available via volume licensing, included proofing tools for English, German, French, and Croatian.
Visit the official Microsoft download page: Microsoft provides Language Accessory Packs for Office 2016
Under "Choose Editing Languages," ensure Serbian is added to the list to enable spell check and grammar tools. Restart Office for the changes to take effect. Install the Language Accessory Packs for Office 2016