Mine wouldnt work on a fresh install.
Removed 4.1, Uploaded 4.03… recaptcha then worked. Then updated to 4.1 and it’s fine.
4.03 link – https://downloads.wp.xz.cn/plugin/contact-form-7.4.0.3.zip
Deactivated the plugin, cleared WP Super Cache, reactivated the plugin and now its working
