What if I cannot sign in — expired license, no network, corporate proxy?

The app keeps working at the Community tier's limits. Every one of these reduces capacity and tells you why; none of them locks the application:

• the license service is unreachable
• your lease expired because the machine was offline for a month
• the cached license file is corrupt
• your sign-in was revoked

That is a deliberate design decision, not an accident. Most of those causes are ours rather than yours, and locking someone out mid-incident over our own outage is not a thing we are willing to do. The Settings → Account section (also opened by clicking the avatar at the bottom right) tells you which it is, and it works with no network at all — the difference between "your tier changed" and "renewal failed" is invisible otherwise, and they have completely different fixes.