eM Client pro do not activvate, after i payed the pro version over Paypal

I can not activate the eM Client pro Version after I payed the Sotware over Paypal. Wath musst I do

Please contact me directly on [email protected] with details of the license purchase and I will check it for you.

I payed yesterday 49,95 € over Paypal for the “eM Client Pro Version” but every Time I started the Program I get the Program startet, with following Respons:
Sie können eM Client mit eingeschränkten Funktionen weiterhin kostenlos nutzen.
Um alle Funktionen zu behalten, bestellen Sie eine Pro-Lizenz von eM Client 9.

(Sie verlieren den Zugang zu folgenden
Funktionen:
Notizen, Massenmails,
Mailübersetzung, späteres Senden von
E-Mails, Ansicht der Anhänge, Zurückstellen
von E-Mails und Nachverfolgung, Schutz
gegen E-Mail-Tracking, Threadansicht,
E-Mail zurückrufen, Kurze Notiz)

Wath can I do.

Excuse me for my very bad Englih.

My E-Mail Adress is [email protected] or [email protected]

Your Pro license has not yet been activated.
On the computer where you want to use it, go to Menu > Help > License and click on Deactivate if the option is there, otherwise just click on Activate and paste in the Pro License key.

I dont have the right Pro License key

I sent it to your on your yahoo address.