The maintenance expiration date indicates the versions of Intel Quartus Design Software and IP core that can be used.
All product versions released prior to the maintenance expiration date can be used.
Most license entitlements for Intel® Quartus® Prime Software and Intel® FPGA IP cores are perpetual. Exceptions for products or complementary tools, such as Questa*-Intel® FPGA Edition, are noted in the license file and SSLC with a license expiration date. Licenses for development kits are non-perpetual licenses.
In this case, you can use the quartus version released prior to the 2020.02 and the Nios II version released prior to the 2014.02.
Also, license files have headers that contain identifying information specific to the license, such as the type of license, the primary computer and companion IDs, issue and expiration dates, and a product license summary.
https://www.intel.com/content/www/us/en/docs/programmable/683472/23-4/license-file-header.html
Best Regards,
Richard Tan
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