Block them access to their servers by editing your hosts.txt file. Hope you know it.
Go to %SystemDrive%\WINDOWS\system32\drivers\etc and open the hosts.txt file in notepad.
type in 127.0.0.1 domainname.tld
where domain name will be of the software you are using. You might have to restart your computer for things to take effect. Although I cannot guarantee success, it might just work if you know the domain name. Also I don't know whether it works only for web browsers.