It includes the Tycho-2 catalog (2.5 million stars) and the UCAC4 catalog, allowing you to see objects far beyond the reach of standard software.
Right-click the .exe file, go to Properties > Compatibility , and set it to Windows 7 or XP. skymap pro 12 free
If you liked the "technical" feel of SkyMap Pro, this is the best alternative. It is free, professional-grade, and excellent for telescope control. It includes the Tycho-2 catalog (2