Sites like the Internet Archive (Archive.org) often host ISO files of original installation discs. Old Hardware Bundles:
Do NOT download from random "crack" or "serial key" websites. The Web Edition is free – you do not need a crack. Malicious actors embed malware in fake installers. Altera Quartus II 8.1 Web Edition -Windows- free download
, which supports newer chips but has dropped support for the older architectures that 8.1 specialized in. Sites like the Internet Archive (Archive
Despite its age, version 8.1 packed powerful features that remain useful today: Altera Quartus II 8.1 Web Edition -Windows- free download