Premium does not work and no refund

I had high hopes for the plug in but the DNS challenge kept failing and the developer was not able to fix it. Since the support was okay-ish (friendly but highly unprofessional), I would have settled for a partial refund but got no answer since. I will try to get my money back via freemius support, since I did not get what I paid for, but since the dev kept me for long enough to be a day or two too late to issue a refund via the system, it’s propably be tough. The free version works well but there are dozens of other plug-ins that work for one site. Don’t pay for it if you want to use it on a multisite.