I got your mail (Your Product Subscription will be expired in 89 days)

If UltimateSftp for .NET is out of license, will I not be able to use the delivered running applications developed with it?

Hi, Your purchased software is perpetual, and it still works after its subscription expired. The subscription is for software product updates and support only. When it's close to your expiry date, our system sends some notification emails to remind you about the renewal. The emails contain instructions to renew your subscription. If you wish not to update, ignore the email.