Hello. Just to write here for everyone that will struggle i found the solution. On one forum this is what it says.
Close Blender
Rename C:\Users\YourNameHere\AppData\Roaming\Blender
Foundation\Blender\2.79 to
C:\Users\YourNameHere\AppData\Roaming\Blender
Foundation\Blender\2.79.bak
Use your login in Windows instead of YourNameHere and your version of Blender instead of 2.79
Start Blender again
It works for me and now finaly i have corona and couple others addons :)))))) Sory for my bad english and THANK YOU again for your help!!