Quartus II 4.0 and APEX EP20k600EFI672-2x

HI, This is really old and EOL product. I am guessing the issue here could be either 1) missing file that doesn't got included correctly during QAR archived build in Quartus v4.0 2) Some software compatibility issue between Quartus v4.0 and v9.0 My best suggestion for you is to try out Quartus 4.0 in below link to open back the design QAR file and hopefully it still works. https://www.intel.com/content/www/us/en/programmable/downloads/software/quartus-ii-se/dnl-quartus_sub-v40.html Thanks. Regards, dlim