StarXTerminator plugin won't execute after migrating from an old MacBook to a new MacBook

[ErrolG]

I bought a new MacBook with Affinity photo V2 and the StarXTerminator plugin and used the Migration Tool to migrate my apps and data from my old MacBook to the new one.  On the new MacBook when I open Affinity Photo V2 and try to execute the StarXTerminator plugin (Filters->Plugins->RC-Astro->StarXTerminator) StarXTerminator is greyed out and will not run.  I checked if the "Allow Unknown plugins to be used" setting was checked and it is.  This works just fine on my old MacBook and I am stumped as to why it doesn't work on my new one.  What am I missing?  I have legally purchased and licensed versions of Affinity Photo V2 and StarXTerminator.  Thanks.

[ErrolG]

This problem was fixed by opening up a FITS file, creating a merged layer, selecting the merged layer, and then executing the StarXTerminator plugin.  I was prompted to enter in my StarXTerminator license key and now all is well.