After upgraded APM 17.3.0.5 on APM 17.3.0.10, CASM in Services disappears and in fact the installation folder is empty except there are logs subfolder there . And %temp%Install_17.0.0.114.log shows
[Header]
2021-11-05 18:49:35,009 UTC [10044] INFO InstallationLogger - AppLauncher : UninstallCASMIfExists : CASM found on the machine
2021-11-05 18:49:35,084 UTC [10044] INFO InstallationLogger - AppLauncher : UninstallCASMIfExists : Executable = C:\Program Files (x86)\CA\SharedComponents\CASM\Uninstall_CommonAdministrationforServiceManagement\Uninstall CommonAdministrationforServiceManagement.exe
2021-11-05 18:50:17,740 UTC [10044] INFO InstallationLogger - AppLauncher : UninstallCASMIfExists : Complete
[Footer]
Release : 17.3
Component : ITAM - Installation/Upgrades
Rollback the RU10 installation using server snapshot and then rename Uninstall_CommonAdministrationforServiceManagement\Uninstall CommonAdministrationforServiceManagement.exe to xyzUninstall_CommonAdministrationforServiceManagement\Uninstall CommonAdministrationforServiceManagement.exe and then install RU10 again