License handles # of connected accounts more flexible
The new version detects only client accounts in use by all allocations and not all accounts associated with a connection. So you can have for instance a license for 4 accounts, when you use only 4 accounts even if your TWS / API connection manages more than 4 accounts.
This feature makes it possible to run TWS or Gateway without a noteable break or login 5 days in a row. Just setup Auto Restart feature and login once per week, e.g. at the beginning of the trading week.