Hi Lou,
There is no need for you to upgrade your switch, if you are not seeing "forwarding-options" in the hierarchy it simply means that you are running JunOS without ELS(Enhanced Layer 2 Software). But this should not stop you from port-mirroring capabilities.
Instead of using analyzer in front of "forwarding-options" try the same like below:
set ethernet-switching-options analyzer employee-monitor <>
Please refer the below KB article for more information:
https://kb.juniper.net/InfoCenter/index?page=content&id=KB10878&cat=SWITCH_PRODUCTS&actp=LIST
If this worked for you please hit "accept as a solution" as this helps the community members with same query redirect to this post.
Kudos + "accept as a solution" -- star, you are!
//Nex