Problem with Avast Premier activation on WinXP (weird situation)

Hi

I got Avast Premium Security license for 10 computers renewed from many years and it was working fine on my computers equipped in both Windows XP and Windows 7 recent years.

This year I was able renew exactly same 10 computers subscription once again for another one year (directly from Avast installed on Windows 7), but this time new activation seems that extends the license only on Windows 7 computers (all my computers has same “subscription number”, both XP and Win7 computers).

I understand that support for XP is finished, but the weird thing is that I can still install “Avast Premier” from official avast_premium_security_setup_online.exe installation file on XP. It install normally with default one month free subscription, actual virus definitions and all seems to work fine.

So…if version:

Program version: 18.8.2356 (build 18.8.4084.409)
Virus definition: 230117-8
Definition number: 25758266

is still working normally - why I can’t use my valid license to it ?
I did not checked it, but even XP “Avast Premier” 18.8 version has option “renew your subscription”.

I wonder what will happen then ? Will I stuck with the same problem ?
Anybody know how to solve this matter ?