I am using the latest EveMon, the HttpListener fails for adding characters on 6.0.2, however if you copied the AppData settings.xml that contains your character reference from a Windows installation that worked (I also have a Windows VM) and token you can get it to work on 6.0.2, however, on 7.0.0, that just flat out fails now. The token will expire after a period of time so this is a periodic thing you have to do.
These forks of Evemon are looking like they’re violating the upstream license they forked from by not including the upstream license, see here https://forums.eveonline.com/t/evemon-license-and-proprietary-file-content so there is maybe a chance they could get taken down from github if it is not addressed.
They should be including the upstream license in their fork, not just add in their own license willy nilly and forget about the upstream commitment. You don’t want to ignore license commitments on FOSS as it WILL get reported by the FOSS community, they take that stuff seriously, as seriously as HAM’s and their radio spectrum.
Reports here GitHub Support
imo it is better that we get a cleanroom app for Eve and one that will compile and work across platforms using a better toolkit.