Hello!, i tryed to install roudedcorners directly through Sketchucation pluging stores, after instslling freddo library, and it appears this when autoinstall: ( inside a box)

You can Write to the Main Plugins Folder, and...
You have a Custom-Plugins Folder.

C:/ Users/noemi/appdata/roaming/sketchup/sketchup2015/sketchup/plugins
c:/ Programdata/sketchup/sketchup2015/sketchup/plugins

i don't find this folder and don't know what does it mean... should i create another folder, what should i do? thanks for any help!