When you say there's no invoice, do you mean there's no email at all with license key/etc. to confirm your purchase, or are you specifically referring to an invoice email?
There’s no email or anywhere to fill it in the first place during/after purchase, just a screen with the license code. An invoice or purchase confirmation mail would have been nice… I do hope there’s a way to retrieve the license for clumsy people like me. :)
And auto-updater tells me that I have version 1.0 and there is a new version 1.0.0 . And if I try to update, there is an update error.
It is also a bit confusing if you buy it, because you go to download and can then decide to download for trial or purchase. If you purchase, you just get a screen with the key. But no download. It is not nessasary clear, that the trial is also the main download.
And after purchasing, there is no invoice.