Sometimes, highly compressed files refer to "Portable" versions of Office. These are modified versions of the software that have been stripped down to run without installation. While these do exist and can be smaller in size, they are often unstable, lack features, and are still technically illegal and potentially unsafe. Furthermore, running software directly from an executable without a proper installation often bypasses essential security checks.
While downloading highly compressed versions is convenient, it comes with risks. Download Microsoft Office 2019 Highly Compressed
Many sites offering highly compressed Office 2019 do not actually provide a working product. Instead, you might download a "download manager" (adware) that floods your browser with ads, or a password-protected archive that forces you to complete surveys, harvesting your personal data. Instead, you might download a "download manager" (adware)
Microsoft does not release an official "highly compressed" version of Office 2019. Microsoft distributes Office via Click-to-Run technology, which stream installation but does not compress the final product to 500MB. If a website claims to have a 200MB installer for Office 2019 Pro Plus, it is 100% a scam or a virus. they are often unstable
Simple, one-click installation that extracts the full software automatically.