When running the Web Agent installer, on the step
"Verify that the ISAPI Filter is First in the List When Using Classic Pipeline Mode",
no entry named "handler-wa" is to be seen.
The installer is picked up from package :
GEN11102535E.zip
At first glance, you run the wrong installer as the one you point out
is the GA version published in 2013 (1).
According to our Support Matrix, to run Web Agent on IIS 10 on Windows
2019, the installation of Web Agent 12.52SP1CR10A minimum is required
(2), the latest vesion being 12.52SP1CR11 (3).
(1)
CA SiteMinder Blended
| File | DATE |
|--------------------------------------------------------+--------------------|
| CA SiteMinder Web Agent r12.52 for Windows-64-ESD Only | Dec 23 2013 3:52PM |
| (GEN11102535E.zip) | |
https://support.broadcom.com/download-center/product-files.html?sku_code=ETRSB099000&release=12.52&gen_level=0000&language=EN
(2)
PRODUCT SUPPORT MATRIX Symantec SiteMinder 12.52 & 12.52 SP01
| Web Server | Version | Windows |
| | | Server 64-bit |
|-------------------+---------+---------------|
| Microsoft IIS 64- | 10 | 2019 (SP1 |
| bit | | CR10A) |
p.5
https://ftpdocs.broadcom.com/cadocs/0/contentimages/SiteMinder_12_52_Platform_Support%201Apr2021.pdf
(3)
SSO WEBAGENT R12.52 SP01 CR11 [#2820]
ca-wa-12.52-sp01-cr11-win64-64.zip 466 MB
https://support.broadcom.com/download-center/solution-detail.html?aparNo=SS15420&os=ANY