After installation no access to www.letsplays.org/blog/

Hello,
I need urgent help.

I bought the theforest-3792360-Orizon-the-gaming-template-WP version of WordPress at envatomarket today. The price was $ 50. I paid with Paypal.

The template I installed under http://www.letsplays.org/blog/. Now I no longer have access to my admin area. After installation, the message came that needs to be updated to the database.Now I get the message: You Do not Have Sufficient permissions to access this page.

I must continue to work urgently. I need a quick solution to the problem.

best regards, Andreas Scheffer
smoketrend GmbH