I have downloaded and moved the files to C:\windows\fonts folder.  When I try to register them I get the following message:
1 Proc fontreg mode=all msglevel=verbose;
2 fontfile "c:\windows\fonts\source sans 3.ttf";
3 run;
ERROR: A problem was encountered with "c:\windows\fonts\source sans 3.ttf". It is not a valid
file or directory. 
 
SAS tech support tells me the FONTFILE statement must be the name of the font file on disk.  I have no idea what the name is and on-line searches have offered nothing. 
Hoping someone out there has successfully accomplished this and is willing to share.
Thanks
 
Mark