Virtua Tennis 4 is a legacy title that has been like Steam since 2015. There is no official "free download" for the full version provided by the publisher. How to Acquire the Game

: You can search for used retail PC DVD copies on auction sites. These often require the Games for Windows Live (GFWL) software to function, which may require modern community fixes to run on Windows 10 or 11. System Requirements

Because it is no longer sold directly, your options are limited to the secondary market:

The game is well-optimized for older hardware. Most modern PCs can run it at maximum settings. Virtua Tennis 4 system requirements - Can You RUN It