Have licensed version of LRTimelapse V 5.6.2. Just updated to version 5.7 and now my copy is not licensed anymore. To make problems worse the licence key that I have on my pc is not visible when I try to enter it again. The information about your licencing shows n/a.
Something is wrong here.

Normally the upgrades don't require reneving the licensing, but for some reason your install seems to have lost the licensing information this time. But that's no problem at all.
I'll forward the email with your license again, just reactivate it as described in that email.