Here is the general process, based on the most common and well-documented methods from the community. We'll use Test Drive: Ferrari Racing Legends (PC) | Download Save Game File (100%) from savegame.info as an example, as it's a trusted source with clear instructions.

—it can take dozens of hours to unlock all 52 iconic Ferrari models and 36 track variations.

Before installing a new 100% save, you must locate your current profile to back it up or replace it. On Windows, the default save location is:

There are two possible locations for the save file. The file is named with a long string of numbers and letters (e.g., 1234567890123456.sav ).