Hi catersf,
Please, in general, refer to the Blender forum section for specific question about the plugin:
viewforum.php?f=32In the Releases section divided by operating system:
viewforum.php?f=113you can find v2.25 - 9.13, that has no support for Pascal cards like GTX 1080, and v3.3.04 - 10.6 that is the latest v3 version with Pascal card support.
Have you installed v2 plugin? In this case you have to update to v3 in order to use your GTX 1080.
ciao beppe