Limacta should be added automatically into your MS Word when you are logged with your company account, than just open Limacta plugin, or if is not visible, use Add a new plugin from the company store. If you use Limacta Cloud, you have to install it from Microsoft Store.
When you use the company account, Limacta plugin should be enabled automatically
Use menu Home
Locate plugin Limacta on the right side of menu
When you have the company account, but for some reason Limacta plugin is not enabled automatically, you can just add it.