Assegnate 5 su 5 stelle

help!!!
https:addons.mozilla.org/zh-cn/firefox/downloads/file/90928/flashgot-1.2.1.23-fx+mz+sm+tb.xpi?src=api&confinrmed=1,
error:down error
-228
what should ido?

Questa recensione riguarda una versione precedente (1.2.1.23) del componente aggiuntivo. 

This usually means Mozilla's mirrors are not all in sync yet.
You may want to install manually from the direct link at http://flashgot.net/getit#direct