Gigapixel doesn't open as a plugin in Photoshop

Gigapixel will open as stand alone but not as a plugin in Photoshop via file - automate. When I try to open it, it creates a new layer called Gigapixel but the control panel doesn’t open. My other topaz plugins work properly.
this is what the Adobe plugin folder contains “tltopazgigapixelaips_64” as a (shortcut) and it points to Gigapixel in topaz LLC folder which is the same as the other topaz plugins
Please advise
Thanks Ray