While newer versions like Quartus Prime Lite are the current standard, version 8.1 remains necessary for specific legacy projects or older development boards. FPGA Operating System (OS) Support - Altera
Are you maintaining a legacy FPGA design or working with a classic Cyclone or MAX II device? While Intel (formerly Altera) has moved on to newer versions of Quartus Prime, the Quartus II 8.1 Web Edition remains essential for supporting older chip families that are no longer supported in modern software. Altera Quartus II 8.1 Web Edition -Windows- free download
The for Windows is a legacy version of the comprehensive FPGA design suite released in November 2008 . It is a free, no-license-required version specifically designed for CPLDs and medium-density FPGAs. While newer versions like Quartus Prime Lite are