Subscribe to Comments Reloaded Better Unsubscribe

Just install the plugin using WordPress admin dashboard, or upload the ZIP file.

We recommend that you test the plugin. The detailed steps are:

after Subscribe to Comments Reloaded was installed activate this plugin
comment and subscribe to some post as a non-logged in visitor
approve the comment or confirm the subscription if you are using double opt-in feature of Subscribe to Comments Reloaded
post another comment using different email
check that you received your notification
check that the "Manage your subscriptions" was changed to "Unsubscribe" and that clicking the link opens the subscription management page with "You are now unsubscribed from {post title}" message at the top. You can see what it should look like on the screenshot on the plugin page.
use our support forums to report any issues
if you want to use the bounce processing, you have to use SendGrid and either WP Mail SMPT or Mailer to send your WordPress emails

Subscribe to Comments Reloaded Better Unsubscribe – Installation