You'll notice that the key request back in 2016 had no expiration and yes, it was installed on my laptop until I wiped it a couple months ago. Though I don't have my original receipt, I do have the copy of my key request back in 2016. Nevertheless, my key did not work and I did some investigating. I remember getting an email a couple years back saying it was about to expire and I laughed it off like no, that was a one time purchase.
Downloaded the professional free trial and went to insert my key and sure enough it said it was expired.
I installed the free version of ccleaner, noticed there was no where to input a key. So today I finally decided to upgrade my computer, as I only really use it for personal finance and bills, but the old one was slowing down a bit. In 2016 I did a factory reset(not sure if this was the time of windows 10 release or not, my laptop started as windows 7). I actually kept my laptop in good condition and had it for several years. I made a one time purchase, god knows how long ago. So I myself have been using ccleaner for years.