You can’t even register

Hi there. We are sorry you are having a hard time registering/logging into the plugin – To be sure, is it the Mailchimp app you are trying to access or the plugin https://www.ads-software.com/plugins/mailchimp-for-woocommerce/? what happens after you have downloaded the plugin? Do you have an error message?

If you need support, I recommend asking at https://www.ads-software.com/support/plugin/mailchimp-for-woocommerce/#new-post so the plugin’s developers and support community can help you with this.