Hello Vivek,
You can download the requested files from Cisco.com > Support > All Downloads > Products > Security > Identity Management > Cisco Secure Access Control Server Solution Engine > Cisco Secure Access Control Server Solution Engine 4.2 > Secure Access Control Server (ACS) Solution Engine-4.2.0.124
ACS 4.2.0.124 latest patch right now is Patch 17. Also, there is version 4.2.1.15 available for both the ACS SE and Remote Agent (For Windows Authentication). If you are going to patch your ACS SE it would be recommended to either upgrade to the latest patch (17) or to 4.2.1.15.
Patches are cummulative as well so applying patch 10 will include Patch 9 fixes as well. You would be looking for:
1) applAcs_4.2.0.124.10.zip
2) applAcs_4.2.0.124.10-CSUpdate.zip
3) Acs-4.2.0.124.10-RA.zip
You need to apply applAcs_4.2.0.124.10-CSUpdate.zip first and then applAcs_4.2.0.124.10.zip on the ACS SE. On the Remote Agent you will install Acs-4.2.0.124.10-RA.zip.
Both the applAcs_4.2.0.124.10.zip and Acs-4.2.0.124.10-RA.zip have a link to the file release notes which include the patch installation instructions.
You can also review the following:
Appliance Upgrade and Patches Procedure
NOTE: A Cisco CCOiD is required to access software downloads.