Sure UVW Map - adaptation to 2.80 - TOOL-PROPS does not show up!

I need help from someone who knows Blender Python API.
I am adapting old addon “Sure UVW Map” and in 2.80 TOOL_PROPS floating panel in 3D does not appear when pushing the button to run the action. Action is running but panel does not show up.
Here is the addon to download:

Please help!