Suppose that Office 2016 Pro Plus (MS ActionPack, MSDN subscription etc.) is installed on your PC but you still need to add some language support. In my case, I need to add the Russian proof tools to the English Office that includes already the French language support but doesn't contain any Cyrillic spell checking.
The recommended way is to download the language pack and install it. However, it doesn't work for me, the error 30182-4 is occurred. Unfortunately, none of proposed workarounds don't work for me (repair, full reinstall).
Office 2016 Mac Greek Language Package
For example, the same Outlook.ar-sa folder is used in the Arabic language version of Office 2016, the Arabic language version of Outlook 2016, and the Office 2016 Language Pack - Arabic. Note Language tags are also referred to and used as 'language IDs' for some procedures. I have an office 2016 Volume license edition installed on my computer. I want to install proofing tools for Greek. It's easy to change the language of your Office 2016 and it's free compare to the previous version of Office. If a language accessory pack is described as having partial localization, some parts of Office may still display in the language of your copy of Microsoft Office. If a language is listed only once, for example German, then that pack includes the tools for all countries/regions that use that language.
Office 2016 Mac Os
The solution is to download a language-specific Office ISO (Russian in my case) available for all MS subscribers and install it over existing English Office. Then go to 'Office Language Preferences', add required tools and set options.