1. Step 1:
Press on modelsim-win32-6{1}.4c-se.

2. Step 2:
 Press on next.

3. Step3:
 Press on agree.

4. Step 4:

5. Step 5:
 modelsim 6.4c =>Man_K=>Keygen.
 Press on start menu then press on licensing wizard .

6. Step6:
 Press install new license.

7. Step7:
 Find the path of license file which is in same place of mentor
Kg. then click continue .

8. Step8 :
Press on modelsim