Let me know which emulator you're actually using, and I can give you the exact safe download link.
One hidden feature of GPU Core 2.0.0 is partial support. PGXP fixes the PS1’s lack of depth buffer, stopping vertices from shaking. Epsxe Gpu Core 2.0.0 Plugin Download
This specific core was originally ported from the Android version of ePSXe to the desktop versions to ensure cross-platform consistency. Downloading and Setup Let me know which emulator you're actually using,
: Load a PS1 game to test if the plugin is working correctly and if the graphics have improved. Epsxe Gpu Core 2.0.0 Plugin Download