Upgrade Essential to Business question

Hi,

I am aware that Hikashop Essential and Business versions can be installed on multiple domains. However, the "Essential to Business" upgrade page reads:

You will receive HikaShop Business and will be able to install it on one website where HikaShop Essential was installed.

Does the ability to use it on multiple sites not exist when upgrading, making the purchase of the full Business version necessary to allow multiple installations?

Clarification will assist in making the right purchase decision.

Thanks,
Martyn.