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Upgraded to 1.3.3.0 - getting the same issue with the script as before 
Hmm Interesting.
Question...
Re "Python Rigol_MSO_LicensingUtility_2.10b.py -i 192.168.128.101"
Why is your I.P. Address 192.168.128.101 ??
why isn't it 192.168.0.101 or .1.101 ??
Do me a favour and check if your router Has DHCP enabled and if your scope has DHCP enabled
or the other way to go around this is...
If you have an old router in the garage or bedroom, Plug it in and use that and see if you get the same result.
it doesn't need internet connection and doesn't need to be a new router, it can be any old piece of crap as long as it powers up and runs DHCP
and has a few Ethernet Ports
it looks to me like either it's a subdomain issue or a firewall within the router issue.
so far i wouldn't worry about your scope being bricked. it's safe for now
but if you can't bring up, information..... something is wrong from a network point of view
or it could be python, but i doubt it
Do you have another router you can try it with ? Most times you can get routers for free from gumtree and what not.
Try that an let me know how you go and let me know what the DHCP status of your scope is
if needed, i'm happy to jump on skype and help you with this one on one if you like
or we can continue like this