Sync gives 14-day trial period to try all Pro features, it's available in both Sync Home (for home use, for individuals) and Sync for Business (for commercial use).
Resilio Sync Business license or trial expired
When the 14 days trial are up or current license expires, Sync for Business requests applying a valid license. If you've shared license seats with other users, when your license expires, the licenses (seats) you've shared will expire as well, on the same date, meaning that those users won't have access to Pro features either.
License, billed on a subscription basis, will expire and not renew if the Automatic renewal was disabled through license management console, or if the renewal transaction was decline by the bank.
You can renew the license through License Management Console.