This post will guide you on how to legally download the of Quartus II 13.0.

Select for the free license. The file name typically looks like: 13.0_quartus2_web_edition_windows.exe (size ~2.5 GB for full, ~300 MB for web installer).

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Visit https://www.intel.com/content/www/us/en/products/details/fpga/development-tools/quartus-prime/resource.html

: You can typically find 13.0 SP1 by navigating to the Intel FPGA Software Download Center and selecting the "Legacy" or "Archives" section.