Installer cannot establish connection with SSL error

Let me check this issue with our internal team to understand why the Quartus Prime Installer is unable to download the installation files.
In the meantime, as a workaround, you can still download and install Quartus Prime Lite Edition using the .tar package (Quartus-lite-25.1std.0.1129-windows.tar) or Individual Files directly from the Altera Download Center:

Quartus Prime Lite Edition Download:
https://www.altera.com/downloads/fpga-development-tools/quartus-prime-lite-edition-design-software-version-25-1-windows

I’ll update you as soon as I have more information from the internal team.

Best regards,
Richard