Hi,
If you are using any OpenCore plus IP & that requires license then during Evaluation mode Intel Quartus compiler generates only time limited device programming files( time_limited.sof) that will expire on that time limit.
Refer the "4.3.4. Intellectual Property (IP) Cores Licenses" from link below,
https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/manual/quartus_install.pdf
If you want to purchase license for IP then please go through the SSLC,
https://fpgasupport.intel.com/Licensing/license/index.html
Regards,
Vicky