With new limits to 'Connect' version to 10 device limit, we cannot extend the limit of devices for the Connect version. If you plan on upgrading to the pilot version please contact Sales to get Entitlement.
I have fought that for many weeks now and they will do a deeper multi-year discount, but you got to be willing to pay for multiple years up front which takes away for non-profits. If you don't want to pay it will leave you with two options. 1. just go command line and get all the feature for free. 2. create a second "free" and split your devices between them.
if you choose #2, just make sure you hive is the same name/password along with any other setting you have for your setup.