Think of it like asking to “download USB 3.0” for an old USB 1.1 port. You can’t—because USB 3.0 requires specific physical wiring and controllers. Similarly, Shader Model 5.0 requires specific on your graphics card.
After updating, restart your PC and try the game again. Download Shader Model 5.0
Unfortunately, you have a hardware limitation. Here are your options: Think of it like asking to “download USB 3