Same here. I had an issue in January with error code 13, "Provided product was not found". This after I had been using it for about a year. I got a response the same day I emailed support. If you hear from them please share.
Code 10 looks like an http request. If it's trying to talk to a central license server that's become unreachable the software might become unusable. I hope it's a not permanent condition. Maybe if they're going to abandon it they would consider making if freeware. That would be a shame but better than killing it outright.
Midinous is a very similar program, though I don't care for it. It runs on the Steam platform, which requires you have steam installed an running in the backgroud.