Here are some things to try for the Error 200 on a Mac:
Disable OS X Firewall
Also worth ensuring the OS X Firewall is switched off during download and that any router firewall is not blocking it in some way.
System Preferences > Secuirty & Privacy > Firewall
This is in OS X 10.9 Mavericks, It may be slightly different in other versions.
Reset DNCP lease
System Preferences > Network > Select the network you are connected to (indicated by green circle)> Click Advanced > Click Renew DHCP Lease
Change your DNS
Change your DNS settings to a public DNS server (non-ISP).
I used Google: 8.8.8.8, 8.8.4.4
On the Mac, to change the DNS server IP addresses go to:
System Preferences > Network > Advanced… > DNS
Note the existing ones usually automatically added by your ISP then change them for the Google ones of other you prefer. Remember to Apply changes after clicking OK when done.
Uncheck Auto Proxy Discovery
- Navigate to the System Preferences under the Apple Menu.
- Open up Network in System Preferences. (Usually located in the third row, third icon.)
- Make sure the network connection with a green dot next to it is selected.
- Click the Advanced button in the lower right corner
- From the drop down menu, click on Proxies.
- In the "Select a protocol to configure" list
- Uncheck "Auto Proxy Discovery”
Try these. If they don't help can I ask that you open a new thread with the details here and we can try to help resolve this.
In the meantime keep trying via Support for any official solutions.