Draftsight Licence query

Hello all,

I've scoured the web for an answer to this to no avail, with no help from the support page being "temporarily unavailable for maintenance."...

Anyway, preface: We have an active subscription for draftsight professional, we want to upgrade from 2019 to 2023 on the same machine but get the error "Activation transaction failed: Serial number not entitled to DraftSight 2023".

Question: Does the subscription not allow for the yearly version upgrades? I assumed it did given it was a yearly cost for the software.

Thanks in advance.