Arial (Body CS) is not a standalone font file you need to download separately; rather, it is a theme designation
Once you have the legitimate font files, installation takes seconds: arial body cs font download
: Installing any Microsoft 365 or Office product will automatically install the full Arial family. Arial (Body CS) is not a standalone font
You’re looking for information about downloading fonts named “Arial,” “Body,” and “CS” (or a CSS/HTML context) — or how to set the Arial font as the body font in CSS and where to obtain legal font files. I’ll cover: licensing and where to get Arial, how to set fonts in web/CSS (body font), what “CS” might refer to, and legal alternatives. : In Microsoft Word, when you select "Arial
: In Microsoft Word, when you select "Arial (Body CS)," the program actually uses the standard Arial Unicode MS font already installed on your system. Microsoft Learn How to Get It