Just an update to this folks.
100webspace.net never responded, the support@ address didn't bounce (so presumably they did actually receive it), but the postmaster@ address did.
errorsguru.com is no longer a Paretologic affiliate, but instead, is now peddling a much much worse "fully fledged" rogue - RegTool. And what have errorsguru.com' hosting company had to say? Well, disgustingly "Robert R., Abuse Coordinator" at DreamHost, had this to say;
FYI, I never said the site WAS peddling RegCure, I said it USED TO (until Paretologic killed it). Alas, he's evidently incapable of analysis, relying solely on VT results (presumably that's what he used, find it difficult to believe he used multiple scanners himself). Oh and Robert, NOD32 blocks regtool.com before the site even loads - so whilst the app itself may not yet be detected (nope, I don't know why it's taking so long either), the site certainly is ;o)
I am however, guessing our dear Robert, didn't check with Malwarebytes AntiMalware, else he'd have seen it is indeed detected by a pretty big player in the AM field;