For license activation please follow the following steps.
Complete the purchase
You need to buy from our plugin page here
After completing the payment you will get an email with license key copy the license, you can also get the license key and order details on My account page here
Then go to your site and Post Grid Combo Setting page, Under the license tab you will see the license input field
Then Paste the license key and save the settings, After saving the settings you will see the license details.