Mark Hildebrandt said:
Can anyone help?
If it's not a GPU supported by Apple officially it may not work with Wirecast. You must have Wirecast 12.2.1 or higher. You may need to test 15.1.2 as there will be no updates to older versions. If you don't have a working GPU at all then Wirecast is not going to work as Xeon processors don't have integrated GPUs.
And these only mention Mojave
Yours isn't on either list, unfortunately.