This does not appear to be so much about updating older software, but removing access to specific CC versions that appear to be the subject of a lawsuit (perhaps between Dolby and Adobe). The versions that have been removed by Adobe, through no fault of the paying subscribers, likely violate licensing/technology that is being contested. In other words, Adobe appears to have violated some sort of licensing and is removing all software that may have that technology in it to avoid further lawsuits.
https://feedback.photoshop.com/photoshop_family/topics/older-versions-of-cc-apps-no-longer-legalIt also appears that this is being couched in the spin of keeping all users of the CC plan as up to date as possible by only offering the latest two versions for download while, ironically, Adobe continues to offer for download much older (pre-CC) versions that likely do not violate the licensing that the previous CC versions potentially do.
This is some of the verbiage that was issued by Adobe:
http://m3-page.mail.adobe.com/nl/jsp/m.jsp?c=%40S4EsvFMJsMlXcwyPwzy8BqClz2zaLacSDg5JyRvKYjg%3Dand here is the vague blog entry that couches this in the "keep up to date" reasoning:
https://theblog.adobe.com/changes-to-creative-cloud-download-availabilityOne might interpret this as Adobe protecting itself at the expense of customers who pay the subscription to access the versions of software that have suddenly been made unavailable. For customers who pay the subscription and need access to those versions, I can understand how that might make them unhappy.
It would be nice if Adobe was more straightforward and explained to its paying subscribers affected by their decision, in plain language, why the CC applications subject to disagreement are being removed from users' access, instead of just suddenly, and with little explanation, removing access (or attempting to make it seem like they are just super concerned about all CC users staying up to date as possible).
As a side note - Adobe's "keep up to date" blog entry states that the CC versions available for install will be for the previous two versions, but in my current version of the CC Desktop app, I can only download CC v 20.X (PS CC2019). No other versions are available. A couple of things to take away from this: this is not being handled real smoothly, and, please Adobe, can you update your application naming conventions so that the versions are homologized and consistent.
kirk