New extension does not show in Slicer 4.8 ExtensonManager

Support
,
3

Slicer 4.8.1 packages have been marked as released (see http://slicer.kitware.com/midas3/folder/4989) and should show up on http://download.slicer.org/ shortly.

See Slicer 4.8.1 release and transition to Qt5 and VTK9 - #9 by jcfr