WD for Mac - Registration thing

I went to update to version 299 this morning as I do. When I to start the app it asked me for my registration code and need to register it. SO I went back to the time machine and got both the app and the data file from yesterday re installed and I am fine.

My question is, did something change in the policy, is there an expiration date on the mac app? if so I have no problem paying or was it a quirk?

not that I know of
you do not say what version/build you were using before