[woodruffw]

> Software updates shouldn't leave the user with nothing unless they pay.

I didn't leave it unregistered for long enough to confirm this, but: ST has historically been fully functional even when unregistered -- the only difference between a registered and unregistered copy is/was the nag dialogue they display every 10 saves. I don't think it's accurate to say that this update "leaves the user with nothing" -- the update was fully functional (and reversible!) right out of the box.

> Also, on Linux, there is no indication that the license would be invalid, or that the upgrade required further payment.

Same on macOS. I agree that this should have been made much more explicit.