In your case, you would need two concurrent licenses to run the bots in parallel on 20 different VMs provided that the processes are executed and completed sequentially. You could even use a single license for this. If you need all processes to run simultaneously then you would require 20 bots each with its own license.
UiPath offers many different licenses for studio, orchestrator, and robots that I’ll detail below and it may be that there are other license types that better support simultaneous executions.
UiPath - Attended Robot - Concurrent User
Concurrent licenses are available ONLY in the case of the Orchestrator scenario. 1 connected user, unlimited users, and workstations defined. Attended Concurrent User License - the No. of Attended Concurrent user licenses purchased equals the maximum number of users who are allowed to simultaneously connect their attended robot to Orchestrator, regardless of the number of users and machines defined in Orchestrator.
UiPath - Unattended Robot - Concurrent Runtime
Concurrent licenses are available ONLY in the case of Orchestrator scenario. 1 active runtime, unlimited users and workstations defined. Unattended Concurrent Runtime License - the No. of Unattended Concurrent Runtime licenses purchased equals the maximum number of unattended robots that are able to execute back-office processes simultaneously, regardless of the number of users and machines defined in Orchestrator.
UiPath - Orchestrator
Robot Management and Control System supporting: release management, centralized logging, reporting, auditing, and monitoring tools, remote control, centralized scheduling, queue/robot workload management, asset management. It provides a limited amount of tenants (e.g. separate logical environments of robots, processes, users and systems and data).
UiPath - Studio - Named User
One named user can access the Studio. UiPath Studio is the Process & Workflow Designer tool. It runs only on Windows like the robot which mimics the user keystrokes of the target Desktop environment. It enables users to automate with highly intuitive tools (not code): process recorders, drag & drop widgets, re-use best-practices templates or refer to other work libraries.
UiPath - Studio - Node Locked
Node-locked licensing includes the Studio installation on one machine but multiple users can log in. UiPath Studio is our Process and Workflow Designer tool. It runs only on Windows like the robot which mimics the user keystrokes of the target Desktop environment. It enables users to automate with highly intuitive tools (not code): process recorders, drag, and drop widgets, re-use best practices templates or refer to other workflow libraries.
UiPath - Unattended Robot - Node-Locked Unattended robot runtime executes RPA workflows for back-office activities. It is controlled, deployed and managed by our central process automation system - the Orchestrator. It runs on a virtual desktop, in a secure session, end-to-end, without human intervention. It performs the process end to end, 'lights out' - working business transactions with the help of an RPA work queue.
UiPath - Attended Robot - Named User
This robot runtime is connected to an authorized licensed user. Attended robot runtime executes RPA workflows, augments human activity, deployed and running on a desktop, triggered based on human activity, can provide guidance and assistance and is under direct user control.
UiPath - Attended Robot - Node Locked
Attended robot runtime executes RPA workflows, augments human activity, deployed and running on a desktop, triggered based on human activity. It can provide guidance and assistance and is under direct user control. Multiple users can log in and run on it at a time, linked to a PC or Virtual Desktop
