ENWSInstallOptions.properties can't be found if only Endevor SCM Base is installed, It is recommended to install both Endevor SCM Base and Endevor Web Services on the same CSI at the same time.
On CSM (MSM)
Choose 'custom installation' from the installation types selection list
<Please see attached file for image>

Then choose both 'CA Endevor SCM' and 'CA Endevor SCM for Web Services' from the installation features to install both base Endevor and Web Services at the same time on the same CSI.
<Please see attached file for image>

Set USS File System HLQ for for VSAM data set CSIQUSSM, and USS Directory which is the mount point for CSIQUSSM.
<Please see attached file for image>

After successful CSM(MSM) installation, ENWSInstallOptions.properties can be found under tpv - subdirectory of the USS path (mount point for CSIQUSSM - ZFS file system for Web Services).
$ pwd
/cai/CSIQ180/ESCM
$ ls
software tpv
$ cd tpv
$ ls
ENWSIns.sh EndevorWS-workflow.properties
ENWSInstallOptions.properties EndevorWS-workflow.xml
ENWSInstallOptions.properties.bak PreValid.sh
ENWSUpd.sh SubmitJob.sh
ENWSVal.sh Validate.jar
ENWSacf2.sh enwscv.zip
ENWSracf.sh tomcat
ENWStss.sh