'FocusMagic64.plugin' cannot be opened because the developer cannot be verified
I have been using FocusMagic with Photoshop on my iMac for about a year. It still worked when I migrated up to Catalina a few months ago. But, sometime after the last update to Catalina 10.15.4 I started getting this error message every time I try to use the plugin. Now it is totally unusable.
Any suggestions?

