Coupon Theme New version 9.1 Issue

Thank you for your reply, @vivek.
I deleted the old key in “WP_OPTIONS” table as described on the first page and it worked, so I got the login screen, where I could enter the key and email.
But unfortunately I still have the same error, so when I preview the site, I am just being shown the text ” Please activate your PremiumPress theme here.” several times below each other, and have no idea what to do now?

I haven’t reset the whole site in the Toolbox section, since I’m not interested in deleting all my old listings. Shouldn’t it be possible to upgrade to V9 from V8 without losing all the history at my site?

And it would be great, if we shouldn’t change stuff in the dbadmin database to be able to activate the theme again, but if that’s what it takes…