NOT RESOLVED: “You have an older version of the Premium plugin.”

I get the error message in my dashboard:
“You have an older version of the Premium plugin. The features have been disabled in order not to break MailPoet. Please update it in the Plugins page now.”

MailPoet 3 (New), Version 3.61.0
MailPoet 3 Premium (New), Version 3.60.0 (manual install of the zip-file)

There is a thread on this problem, marked as “resolved”:
https://www.ads-software.com/support/topic/you-have-an-older-version-of-the-premium-plugin/

However, following the instructions given on the page
https://kb.mailpoet.com/article/339-error-you-have-an-older-version-of-the-premium-plugin did not help.

I still get the error message after deactivating and deleting the MailPoet Premium plugin, freshly downloading the .zip file from my MailPoet 3 account and then manually uploading it to WordPress.

Please help!

The page I need help with: [log in to see the link]