: Execute the downloaded .exe file and follow the on-screen prompts. Activate in Office :

Because the links are dead on Microsoft's servers, the tech community has archived the original files. These are the legitimate files directly from Microsoft MSDN (the subscription service for developers), just mirrored by the community.

Microsoft has removed many direct "Language Accessory Pack" download links for Office 2013 because it is no longer supported. However, there are still ways to obtain the Croatian interface: Microsoft Support Language Accessory Pack for Microsoft 365

If you downloaded Office 2013 through a corporate Volume Licensing Service Center (VLSC) or an older Microsoft account portal, log into your portal. Search for "Office 2013 Language Pack" and select Croatian (Hrvatski). Method B: Install via Windows Update