In reply to Richard Rottman.

That's equivalent to expecting Microsoft to update you to Windows 10, because you once used MS DOS 5.0, and they've found security flaws in all of their OS's back until then.

There is a point at which you just need to say no, you need to pay for the upgrade.

That point at which that should be is up for debate, but I don't think any reasonable person would expect infinite upgrades for life, or for a company to provide backwards porting of security fixes to older versions indefinitely.