Installation via FTP

warning

You need to have WebForms Pro 3 installed prior to this add-on installation.

Copy app folder from the zip archive to your Magento directory so that it merges with app folder of your site.
Execute commands:

For Magento 2.3.5:

composer require mailchimp/mc-magento2:^102.3.44

For newer Magento versions:

composer require mailchimp/mc-magento2:^103.4.43

Then execute:

php bin/magento module:enable Ebizmarts_MailChimp
php bin/magento setup:upgrade

php bin/magento module:enable MageMe_WebFormsMailchimp
php bin/magento setup:upgrade

Update

Get the latest version files from your account area My Downloads section.
Copy contents of the zip archive to your Magento directory so that the app folder is merged with the app folder of your site.
Execute console command:

php bin/magento setup:upgrade

Update​

Update