sorry i do not support italysat, i can not even enter that forum, i have to pay to stay, i'm sorry ..
Probably the same issue as OpenViX where the VNetSpeedInfo.pyo will not install from the plugin as it's linked to Enigma2. It should be possible to install the plugin from a Telnet command using the opkg install --force-overwrite command, I removed the .pyo file from the .ipk and it installs fine.
Can I suggest that you remove the .pyo files from your installer M8 and just include the .py files.
I also suggest you add the plugin to the Blue button extensions menu as well as the plugins menu