Intel have released Quartus Prime Pro 20.3 onto their website, here:
https://fpgasoftware.intel.com/?edition=pro
The Standard and Lite versions remain at 20.1.
Note: If you have trouble downloading the software, you might want to open the Web Developer Tools, put a breakpoint on the line that flags an error and look at the active variable list. One of them is a direct link to the software.