hi fredo
i can see that other people had succeeded installing and using the roundcorner plugin
i've extracted the folders into the plugin file and put it by the order u mentioned
when i tried to open the sketchup i'v got errors :
Error Loading File ZLoader__RoundCorner.rb
uninitialized constant LibFredo6::Traductor
i'm a mac user and i would be more than happy to have a solution !!