Let the ISO/DVD autorun and install at least the host software. This installs the minimum requirement for hosts that will be connected to an MD3k SAN (agent, MPIO software, etc). If you also want the management GUI, you can opt to install that as well. Note that the host software will require a reboot of the physical server at the end.
Is there any supported multipathing software/drivers for Windows 2012 R2 and an MD3220?  I don't see any software on the support site.   If not, what is the recommended route of connecting up 4 R620's?  This is a direct-attached SAS setup.  Am I using the native MPIO feature within Windows?  
MD3220 and two 1220 shelves (SAS) - Windows 2012 R2 multipathing software??