I'm very sorry you had that experience. I feel really terrible about it. It's been an extremely stressful 5 months so far.
I tried to communicate the best I could about what we were doing -- a blog post, responding to all the reddit comments on the arqbackup subreddit that somebody else controls, answering thousands of emails. For at least a week I answered 300+ emails/day while simultaneously trying to diagnose and fix the issues people were experiencing.
At one point I deleted the Twitter account because I couldn't cope psychologically with all the hate and the personal attacks.
We set about immediately working to make Arq 6.3 "backward-compatible" with old Arq data (rather than import it into the new format, which failed unexpectedly for quite a few people).
A month into it we tried making a UI that's "native" (like Arq 5) and realized we like it better too. So, we missed our June 30 deadline of making Arq 6 backward compatible, and decided to just start over with a native UI.
We were going to ship that as Arq 6.3, but a few weeks ago realized that just shipping it as a point release would be way too disruptive. So it's going to be Arq 7. Arq 6 users of course will be upgraded to Arq 7 for free.
I know we screwed up. We're trying really, really hard to make it right. We promptly refunded every single purchase for which a refund was requested. It's not about the money. It's about trying to do the right thing.
I don't know what else to do at this point. If you have suggestions please let me know.
> bury Arq 6 without trying to fix it
I don't understand this. Arq 7 is the fix for the Arq 6 issues. It's free for Arq 6 users. We're not trying to bury anything. We've been really open about saying we screwed up and we're doing all we can to fix it.