Usually, if the Microsoft Word documents are not too complicated with tables, diagrams etc., the free alternatives programs open them with very minor changes.
And of course, you can always use Microsoft Office Online, where you can use Microsoft Office as before, but online. In other words, you will have a way to open and edit your documents. You will just need to sign in with a Microsoft account.
As for the Enterprise version, what probably happened in your case, is that the technician installed a Volume license in your computer. This type of license is mainly used by large companies, and it is not legal for ordinary users.
If you decide to uninstall the 2 programs, let me know, so I can give you further instructions.