...
It is possible to deploy the OC without an Office 365 ProPlus subscription. However, note that the OC does not fully support Office 2016 and earlier versions. It should therefore only be considered for Office 2019 and later.
If an Office 365 ProPlus subscription isn't available, Please note that installing the OC for all users in an organization will be a bit more cumbersome .if an Office 365 ProPlus subscription isn't available