At first glance, you'll find the latest CR here :
CA Single Sign-On (formerly CA SiteMinder) Hotfix/Cumulative Release Index
https://support.broadcom.com/external/content/release-announcements/CA-Single-Sign-On-Hotfix-Cumulative-Release-Index/6544
Click on "SiteMinder Secure Proxy Server";
If you want to get the windows version :
Go to :
Solution Document: RS98376
https://support.ca.com/us/download-center/solution-detail.html?docid=650316&os=ANY&aparno=RS98376&actionID=5
and locate :
sps-12.52-sp01-cr08-win32.zip
Click on "Add to Cart";
Click on "Download";
You'll receive an e-mail about "FTP Download Request";
Click on the first link inside;
Click on "PREFERRED FTP" and you'll redirected to a web page where
if you need to click on sps-12.52-sp01-cr08-win32.zip (356Mb) to
download it;