I seem to be having the same problem as a previous user…
I have just purchased an Events Aggregator license and although an alert displays saying that it has been validated, when I click on the “Save” button, it does not save it… the license key disappears when the page reloads.
I came across this earlier thread about the issue here:
Import options greyed out / updated license key will not save
I’ve tried flushing the transients (it didn’t find any), and my website is associated correctly in my account dashboard.
Please send me a replacement license key to try using…