DirectX 11 capable card with Shader Model 5 and minimum 4 GB video memory.

The "x64" in the keyword signifies that this software is built exclusively for 64-bit operating systems. Here are the baseline requirements for Revit 2021:

FileCR often adds custom configuration files (e.g., modified LICPATH.lic or DLL files) that are not found in generic warez releases. These modifications claim to prevent the software from "phoning home" to Autodesk to check the license validity.