First of all, I would like to report that I have the same problem as the poster: I cannot buy 2019 license and the 2020 license I bought is a pre-order and won't be available until 01/07/2020. I cannot save a 2019 license because the client just came to me to do an amended return.

I know this is a peer-to-peer site and you cannot help with the issue. I would recommend to log this as a problem in this link, so that it is exposed and hopefully resolved. While you are there, please help to vote my proposal. Thanks.