Installing Lara mailer

Hello Good people,
I have purchsed lara mailer for email marketing.
Not sure how do I install it.
Do I need to install on the server? If on the server will it not replace my running website? Please answer if you have any experience installing the software. Author is not responding at all.

The item says support can take 5 days.

It has not been updated since 2018 which is not ideal but it also says free Installation support so maybe leave an item comment too?