Hi Prakash
APM for SSO is available from support.ca.com, here is a KB that is specific for APM that explain you how to download APM software in new support.ca.com portal
https://support.ca.com/us/knowledge-base-articles.TEC1829834.html
You need to select the product: "CA Application Performance Management for CA Single Sign-On (CA APM for CA SSO) MULTI-PLATFORM"
Then, download the package you need for your OS, for example for Linux, download "CA APM FOR CA SSO R13.1.0 FOR LINUX GEN500000000000412.tar"
If you cannot find the above product, then I suggest you to contact you CA Account Manager so they can fix this license issue.
See also this recording: https://communities.ca.com/videos/5896-demo-how-to-download-product-and-solutions-from-ca-support
I hope this helps,
Regards,
Sergio