Steps to download vSAN Witness OVA from Broadcom Support Portal
vSphere 7.x, 8.x
Please do the following:
1) please go to https://www.broadcom.com/support and login
2) click on "My Downloads"
3) In the search box, type "VMware vSAN"
4) Select the desired product for example "VMware vSAN"
5) Choose version
6) In the search Box under "Drivers & Tools" tab type "Witness"
7)Select the desired OVA to download.
Reference : Product download Help Page
Reference : Product download Help Page