Problem registering

Hi, I need some help re-registering Avast free.
My registration period expires in one day. I’ve tried to reregister on-line, but I get an error stating “not working now, try later” or something like that every time I’ve tried. So I have tried the offline way, filled the webform and got through email a license key. BUT when I try to use it, I get a “non valid key” response :frowning:
Any help would be appreciated.
TIA

Register through the avast ui.

I’ve tried many times before but, as I mentioned, I always get an error stating something like “not working, try later” :frowning: