When installing Office 2016, you must choose between the 32-bit (x86) and 64-bit (x64) architectures. The 64-bit version is highly recommended for modern computers because it unlocks superior performance.
Technically, yes: you can download the official installer files directly from Microsoft servers. However, this is . You can download the installation files for free, but to activate and use them beyond a 30-day trial, you must possess a valid, paid-for product key. A few legitimate direct-download links to the official Microsoft servers for the 64-bit version have been shared on Microsoft's Q&A forums for users who already own a license key. These links are only useful if you have legally purchased a key; without it, the downloaded software will not function. Microsoft Office 2016 Free Download 64 Bit
Are you facing any during your installation attempt? When installing Office 2016, you must choose between