From Siteground Technical Support, when I sent a copy of your reply:
"Hello Christine,
The Demo Content installation option doesn’t appear in the installed theme.
Currently, both X themes are the same versions no matter of the exact name.
baseos | u1522-9am8xmk8tjp8@us1013.siteground.us:~/www/brightmindcanine.com/public_html$ wp theme list
±----------------±---------±-------±--------+
| name | status | update | version |
±----------------±---------±-------±--------+
| twentynineteen | inactive | none | 1.4 |
| twentyseventeen | inactive | none | 2.2 |
| twentysixteen | inactive | none | 2.0 |
| twentytwenty | inactive | none | 1.0 |
| x-7.1.2 | inactive | none | 7.1.2 |
| x | active | none | 7.1.2 |
±----------------±---------±-------±--------+
In this case it would be best to contact with theme’s developer to assist you importing the desired demo content.
Should you need any further assistance, do not hesitate to contact us.
Best Regards,
Zdravko Zamfirov
Technical Support Supervisor"