Hi Neil,
Good day to you.
Kindly refer Cyclone II FPGA support link below.
https://www.intel.com/content/www/us/en/programmable/products/fpga/cyclone-series/cyclone-ii/support.html
The latest supported Quartus for Cyclone II is Quartus II Web Edition 13.0sp1.
http://fpgasoftware.intel.com/devices/
http://fpgasoftware.intel.com/13.0sp1/?edition=web&platform=windows&download_manager=dlm3
For your information, Cyclone II devices are mature devices. you're recommended to use the newest cyclone devices for your new design.
https://www.intel.com/content/www/us/en/products/programmable/cyclone-series.html
At the meantime, you can subscribe to our customer notification mailing list at below link so that you can be notified when an Altera device is going to be discontinued.
https://www.intel.com/content/www/us/en/programmable/support/quality-and-reliability/pcns-and-advisories.html#pdn
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