... Also, whatever happened to the referral program? I had three years of Internet Security lined up from referring Avast to everyone I knew back in like 2012 or so.
Unlike yourself, I never left Avast, so was never out of the loop; I only waited too long to claim my free license.
I also had a license lined up from about that same time period (2012 - 2016) and thought I had lost out on receiving it when they dropped/changed the referral program.
About a year ago (Sept. 2018) I logged in to my Avast account:
https://profile.avast.com/ After some digging around in there, I was surprised to find my 3 year subscription for Avast Internet Security listed.
As I recall, I was able to navigate through all my Avast PCs (almost 50 devices), but looking there now, that info is missing/removed or perhaps in another area..?
Might I suggest, if you can recall your original account credentials, to log in and check your Profile page at least.
EDIT: Ok, so I eventually found this thread -
https://forum.avast.com/index.php?topic=225826.0 Topic: Changes to device section
Apparently since March 2019, Avast has decided to "no longer support Windows and Mac devices in the “devices” section in my.avast.com accounts."