My Cornerstone license purchased on Envato isn’t working! Please help!

I bought a single cornerstone license from Envato for a wordpress website and it isn’t working. It keeps saying invaid license code. It doesn’t even show what the error is when I click on “Details” It shows a blank box.
(Please find screenshots)


for solving purchase code or item license issue will need to get support from the item author. They (author) are the right team to help. you can contact item author through item comments page or author profile page or best option is through item support page.

How to contact an author to get support or for any technical query: