As stated by sstrell, ModelSim has been replaced by Questa Intel FPGA Edition. The Questa starter edition has no line limitations.
If you're interested, you can check the differences between the Questa starter and non-starter editions on the webpage link provided by sstrell.
That being said, you will need to obtain a no-cost license to launch the Questa Starter Edition software, unlike ModelSim, which does not require a license.
Please checkout this guide on how to setup the license.
https://www.intel.com/content/www/us/en/docs/programmable/683472/24-3/and-software-license.html
I don't have the answer to your question regarding obtaining a discounted price license for Questa Intel FPGA Edition. However, you can check with an authorized distributor or email fpgauniversity@intel.com. Hopefully, they will be able to assist you.
https://www.intel.com/content/www/us/en/developer/topic-technology/fpga-academic/support.html
Regards,
Richard Tan