I am also having this same issue. I just installed version 4.9.5 from the WordPress depository and I can’t add any subscribers. It says the table “.wp_newsletter” has not been created. The emails, sent, and stats tables were created. I deactivated and reactivated the plugin, but the table has not been created. How do I get the table created?
same problem, all plugins updated, all WP update. Database error persist.
Check the privileges of the user you use to connect to the database, it seems it cannot change the tables. It’s require to update the plugin.
(ALTER command denied to user ‘databasename’@’localhost’ for table ‘wp_newsletter_test’)