Re: Without upgrading

Hi Fadood,

For the new users who sign up the Office 365 recently, I'm sorry to say that there aren't any ways to get the Office 365 earlier version.

However, about the current situation, I will share some articles referring to pre-upgrade SharePoint Online. Hope you can find the information you wanted from them.
Plan to manage SharePoint Online by using the Administration Center
Share a site with external users

Thanks,
Ida Qiu