Microsoft provides proofing tools (spell check, grammar, hyphenation, thesaurus) via Language Accessory Packs and standalone Proofing Tools installers for older Office versions. For Microsoft 365 (Office 365) you generally install language/proofing support via Language Accessory Packs or use the Office offline installer and then enable proofing languages in Office settings. Microsoft hosts downloadable offline installers for specific Office versions (e.g., Proofing Tools 2016) and a Language Accessory Pack page that offers offline download links per language.
This is the professional method for installing specific proofing tools without an active internet connection on the target machine. office 365 proofing tools offline installer
To install Office 365 proofing tools offline, you must use the Office Deployment Tool (ODT) This is the professional method for installing specific
Open Notepad and paste the following code (example for Spanish): or deployment tool (SCCM
This is where most guides go wrong.
An (usually an .exe or .img file) allows you to copy the binaries via USB, network share, or deployment tool (SCCM, Intune) and run it without real-time internet connectivity.