Hi rombout, yep it was a mistake. I fixed it. And it sad to say i have to stop developing UVL bridge for blender 2.8, because i decide to make a new bridge like 2in1 for UVL and RizomUV same time for Blender 2.8 and it will be paid(commercial). link is here . So i will continue on a new one.
And yeah tools now are on a right side 
a lot of changes in 2.8.
And it’s simplyfied a bit , just for the beginning.
Many thanks!