Purchasing themes / Wordpress subscription

Apologies if the answer to this question is really obvious, but nowhere can I seem to find a single, clear answer.

Through the company I work for we currently have a wordpress business account related to a previous site we created.

I wish to create a new website using the werkstatt theme which I was intending to purchase from here. However, it appears that, to create a new wordpress site, I will have to purchase a second business account from wordpress to be able to install the werkstatt theme.

is this the case? Or do purchased themes come with some kind of plugin/permission that does not require a business account.

Many thanks,

You need a business account to use third party themes on WordPress.com - I would have thought that you could install it over the existing one of you don’t need that any longer