When you cannot procure a new Windows server to migrate to Workspace ONE Access connector 20.10, you can install the 20.10 connector on a Windows server that is running the Workspace ONE Access 19.03.x connector. You can then migrate your legacy connector.
If you are using an existing Windows server installed with the 19.03.x connector, before you install any of the services, you must increase the CPU and memory on the machine. Two versions of the connector will be running until the migration is complete.
You must increase the CPU and memory to meet the needs of both 19.03.x and 20.10 connectors per the Sizing Guidelines in Installing VMware Workspace ONE Access Connector 20.10.
After the migration is finished, you can stop the 19.03.x connector and uninstall it.