You, it is possible to use a premium theme for several domains. To do it, you will need to set up the product as your leading site. Then make sure that all the domains come with your hosting provider’s name servers to avoid losing data. Once you are through this, follow the installation guide. You will need to create domains for all websites of your multishop, e.g., myshop1.com and myshop2.com. After making the addon domain name, you will see that the document root will be something like public_html/myshop1.com. Delete the first part and leave only public_html. Now, open the Admin Panel and add new stores to the main domain.