While 10.5 is great, if you are starting a new project, consider the latest Intel FPGA software, which has fully transitioned to Questa-FPGA Edition
Once you have the installer, follow the step-by-step installation guide above, and you will be simulating your first VHDL or Verilog design within minutes. ModelSim 10.5 remains a robust tool—use it legally, use it safely, and happy simulating. modelsim 10.5 download