If %1 is the actual code, than this is an incomplete registration number.
It should be a 26 character alpha/numeric code.

If you send an email to support@asw.cz, they will send you a correct code. You still have the better part of 60 days before Avast stops updating.

You can also try to IM a Moderator when they are online and they may be able to expedite the code for you.
Unfortunately, I do not have access to them.

Good luck,
Techie