"Licensed Users" denote the total number of users you can add to Prolaborate; Only the users who are added to Prolaborate can participate in reviews, discussions, edit information, create dynamic visualizations, analyze information, and work on all the features of Prolaborate.
The users are neither floating nor named. As they are not named, you can easily remove and add users as needed.
Pro Cloud Server opens your entire enterprise to your modeling efforts. It provides an API based OSLC interface letting Prolaborate exchange information with EA repositories.
No, Annual payment is the only option. You can start a Proof of Concept for free if you want to evaluate Prolaborate with your own Enterprise Architect models.
No, Prolaborate licenses are different from your Enterprise Architect licenses; there's no relation between them.
You will not be able to provide unlimited read-only access (Open Community Acces), Integrate with Confluence, Jira, Azure DevOps, etc. (Integrations), or enable Single Sign-On (SSO). These add-ons can be purchased seperately.
Each add-on can be availed at a fixed price of $1400 per year.