I have the same probleme!
Maxi UI v01.02.06
I had the 1.23 MaxiSYS version, impossible to update!
When i have uninstall 1.23 version, update ok, now a have 1.24 version, impossible to update!!! WTF? It isn't normal!
My message is the same ''network not avalible check network connection" (in french: Le réseau n'est pas disponible, vérifier le réseau)
Help please, i have good connection, internet acces ok, no ethernet and wi-fi at the same time!