It’s all in the FAQs.
So in summary: you need to be connected to the internet to obtain your initial activation, and once every 30 days to renew your offline allowance. If your computer is connected to the internet when you launch your software, it will automatically extend your offline allowance period, so that you will almost always have a full 30 day offline allowance period available. However, running your Steinberg software does not require a constant internet connection (unlike, say, iLok Cloud).
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