Hello Mark,
Thanks for getting in touch with us and for using our plugins.
I’m sorry about the waiting time. Based on our support policy we provide support during the working week only and we do our best to reply to every question within 24-48 hours.
After you have installed the Events Calendar Pro plugin on your website go to your list of plugins via clicking on “Plugins” in the left menubar. Search for ‘Events Calendar PRO’ and click on the ‘Activate’ link below it.
Once it is activated you will find the place for the license key under Events > Settings > Licenses tab.
Let me know if this help or if you need any further assistance. It the latter case please share with me your system information based on this article.
Thanks and cheers,
Andras