Hi, there was a maintenance operation, now the site is available. The “license check failed” means the license set on the Newsletter’s main settings is not correct or the account used to get the license was created with an invalid email (or the email provider refuses our messages) and it cannot be contacted. If you cannot log in or recover the password on https://www.thenewsletterplugin.com, I suggest registering again and getting a new license.
Another reason can be a block by your provider when the blog tries to connect to the validation service or our firewall has a blacklist for the IP of your provider. Excess of restrictions may happen on both sides.
BTW, the license is NOT required, you can even avoid entering it at all and get the free addons, if you need them, directly from the https://www.thenewsletter.com site on your account page.
PS: usually we can solve those problems if we’re contacted directly or via the WP forum, the review system is not the best way to get the issues solved. If you contacted us and we missed to reply, please let me know so I can verify why it happened.
Thank you for yout collaboration, Stefano.