|"how can i download shader 1.1?"|
You can't download a shader version, it's built into the graphics hardware.
"its says that u have selected shader 2.0 and it supports shader 1.1"
In other words, you need video card that at least supports shader 2.0. Your's only supports up to shader 1.1. It must be a very old card because modern cards support shader 4.1.
The only thing you can do is upgrade the video card, but you also need enough RAM & a powerful enough CPU. Here are the MINIMUM requirements for Pcsx2:
Pcsx2 Minimum System Requirements