Do I need to run the Web Agent installer with specific rights?
Yes, to install the Web Agent, you need to run the installer by selecting "Run as administrator".
Our Support Matrix :
IIS 8.5
https://support.ca.com/phpdocs/7/5262/5262_SiteMinder_12_52_SP1_Platform_Support.pdf
The latest Web Agent version for IIS 8.5
https://support.ca.com/irj/portal/solncdndtls?aparNo=RS96390&os=WINDOWS&fc=14&actionID=3
smwa-12.52-sp01-cr07-win64-64.zip
Documentation to install Web Agent on IIS using "Run as Administrator"
https://docops.ca.com/ca-single-sign-on/12-52-sp1/en/installing/install-agents/web-agent-for-iis/install-and-configure-an-iis-agent/install-and-configure-an-agent-for-iis