I have tried manually adding the filter lists and have had some success. The functionality, however appears to be buggy. I notice that if the domain for the host of the filter list is "easylist.to", the filter list always fails to download. My guess is that this is related to the bug for which its bug report is posted:
I have also noticed that if the Proxomitron SSL Helper Program ProxHTTPSProxyMIIis being used on the local computer (which would be more common on a Windows Vista or earlier generation Microsoft operating system), the lists always fail to download for the Maxthon version of Adblock Plus. The lists download correctly in various Chromium versions, Windows Internet Explorer 8, and various Firefox and Firefox-derived broswer without issue while ProxHTTPSProxyMIIis is being used. ProxHTTPSProxyMIIis is described in many placed. One such reference is: https://prxbx.com/forums/showthread.php?tid=2172