"Tasker demo over, you can't use Tasker until you buy it"

[fuzzywu...@gmail.com]

Ok, maybe not exactly those words, but a message very  similar is popping up often on my screen.

If I go the app store there is no "BUY" option.

And - to add a twist to things - I bought it a long time ago anyway.

Someone mind helping me get to the bottom of this please.