1. Install Siemens STAR-CCM+16.06.008 R8 (2021.3.0) Double Precision Win64
   Don't install FlexNET Publisher License Manager

3. Overwrite original <16.06.008-R8 program folder> 
   (by default C:\Program Files\Siemens\16.06.008-R8) with cracked one

4. Copy "license.dat" to computer

5. Create environment variable CDLMD_LICENSE_FILE pointing to license.dat 

6. Reboot

7. Enjoy!

Cracked by TeAM SolidSQUAD-SSQ