2 Tacos for now .... 5+ Tacos when solved

I like headway and have been using it for years.
I had issues renewing it this year and it took more than a month to resolve with a kludge on their end.

I could not resist this Appsumo offer for a lifetime once off payment ... have asked them whether it's safe for me to apply the code when I'm an existing subscriber as I don't want to lose multiple years of history of books read (300+ books).
got a reply after 1 month saying they'll pass it on to the relevant team.