No, neither mjs nor I can do anything about a refund. You see, we are both just fellow
users, like you. You will have to wait for Jérôme to come in here & take care of that.
There is no license for VDH on Safari so you're on your own with that browser.
Meanwhile, how have you gotten on with this advice?
https://groups.google.com/g/video-downloadhelper-q-and-a/c/sNfTCMYfiTU