Pick the app, describe it in your own words, and it comes straight to a person — there is no ticket queue and no first-line script. A one-person company has at least this one advantage.
Give us the address you paid with and the key goes out again.
Email takes a few minutes. If nothing turns up, there are two other ways to your key: it is on the thank-you page linked from your Stripe payment confirmation, and hi@adrianskobiej.pl will always look it up for you.
What you were doing, what you expected, and what happened instead. That is enough to start.
Myriad Calendar is still being built, and Voice is early enough that the next version is not decided yet — so a request sent now has a much better chance of landing than one sent in a year.