I'm not able to Find PS2020 how to get it download?

If you still cannot see it then check that your system meets the minimum requirements needed to run it

https://helpx.adobe.com/photoshop/system-requirements.html

Another way would be to launch Photoshop and under the Help menu, choose Updates.

Open the Adobe Creative Cloud Desktop Application, and click the Apps tab. 

If you don't have the Adobe Creative Cloud Desktop App, see https://helpx.adobe.com/download-install/kb/creative-cloud-desktop-app-download.html