Quartus lite download error (Internet connection cannot be established)

[Marr]

Dear Intel Support Team,

I am encountering an issue during the installation of Intel® Quartus® Prime software, where the installer fails with the error: "Internet connection cannot be established." As shown in the attached screenshot, this prevents the download and installation process from proceeding.

I have already attempted several troubleshooting steps to resolve the problem, including:

• Disabling the Windows firewall and antivirus software temporarily;
• Manually configuring the proxy settings in the installer (using HTTP proxy address 127.0.0.1 and port 7897, which corresponds to my local proxy tool, Clash);
• Verifying that my internet connection is working properly through browsers and other applications;
• Following the solutions suggested in the community thread https://community.intel.com/t5/Intel-Quartus-Prime-Software/Quartus-lite-download-error-Internet-connection-cannot-be/m-p/1625333.

Unfortunately, none of these methods have resolved the issue. The installer still fails to establish a connection even when the proxy is correctly set up and confirmed to be working for other applications.

Could you please advise if there are any additional configuration steps required for the installer to work behind a proxy, or whether there is an alternative way to download the installation files (e.g., offline installer or direct download links)? Any assistance would be greatly appreciated.

Thank you in advance for your support.

Best regards,
Marr

[RichardTanSY_Altera]

I suspect there might be an issue with your laptop or PC's security settings. Please check with IT to see if the system is blocking the download.

Alternatively, you can manually install the software by downloading the .tar file (Completed Download) or the individual files.

https://www.intel.com/content/www/us/en/software-kit/862357/intel-quartus-prime-pro-edition-design-software-version-25-1-1-for-windows.html

https://www.intel.com/content/www/us/en/docs/programmable/683472/25-1/installing-from-tar-files.html

Regards,

Richard Tan

[RichardTanSY_Altera]

Hi OP,

Just checking in—any update on this? Were you able to resolve the issue?

Also, have you had a chance to reach out to IT for further assistance?

Let me know if you need any support from my side.

Best regards,

Richard