Some of the old software before 2010 may not be able to install/run normally on x64 or Windows 10 systems. Be aware of it before purchasing it.
System Requirements for System Center 2012 R2:
http://technet.microsoft.com/library/dn281925.aspx
Preparing your environment for System Center 2012 R2 Operations Manager:
http://technet.microsoft.com/library/dn249696.aspx