If your server doesn't have an internet connection, you can activate your license offline:
Ideal for power users who need cloud storage and encryption for a single computer. License Key Sqlbackupandftp
The most robust version, allowing for unlimited databases, advanced scheduling, and priority support. If your server doesn't have an internet connection,
Depending on the size of your environment, you can choose from several editions. All paid licenses are and do not expire. allowing for unlimited databases