Plex client stop instaling on Apple TV 2

Today i discover that in maintaince extra settings available install Plex client. I cant install Plex client on atv flash 1.5 black. Every time its stop, crash instaling. Where is problem?

You should probably ask this on he Plex forums? My guess would be that the current Plex client is not compatible with the version of ATV2 firmware you are running.