QUESTION: 

Does your module support to convert old guests to customers before the module is installed on my site?


ANSWER: 

I regret that our module doesn't support to convert old guests to customers before the module is installed and enabled on your site, it only supports the function to convert guests to customers after it is installed and enabled on your site.


For more product information, please refer our Magento 2 Guest to Customer page.

If you need further assistance, please don't hesitate to contact us.