Yes. From the admin backend, at the History section, admins can view all the membership updates including Buy New, Upgrade, Re-new

Not at all. The membership packages are built based on customer groups or product the store admins create. And there is not any restriction to the number of customer groups.

Yes. this extension supports all types of languages so you can easily translate it into your wished languages.

Yes, it can work with all types of products well; simple, configurable, downloadable, and virtual products.

Yes, you can receive the email notification from your set email address.  

No, the extension works with simple products only.    

Sure, users can manage their subscriptions from their accounts.  

Sure, with this extension, users can easily send email notifications to one/many users at the same time.  

Yes, the Magento 2 Out of Stock Notifications extension allows visitors to sign up for the notifications about the products being out of stock.    

Yes, the admin has the facility to provide subscription access only to a specific group of customers.