i had another old thread asking for a solution to uninstall ur-extention dll.there finally i found a workable workaround to use cubase and UR mixer together .
so this is it for those who interested (note that the ur integration is now wont work inside cubase)
for windows OS, locate the ur extension dll (program files/common files/steinberg/shared components) open it with notepad and simply delete all its text and save it (make a copy of the original if u still want to use ur with cubase control later)
for mac users i guess it’s the same concept
NOTE: if it wont let you delete text and save,copy the extension dll to desktop,delete the text and save, and copy and paste the new dll to its original location to replace the original extension dll