They mention one reason in the release notes:
> unintended SSE CPU requirement present in previous releases has been removed.
> unintended SSE CPU requirement present in previous releases has been removed.
What did they do feature-wise in newer versions that makes the old versions desirable to some people, to the point that a user would prefer to upgrade them rather than upgrade to the newest version? It's not about system compatibility: the 2.x line supports Windows all the way back to Windows 7.
I'm content to dig into the docs but I was wondering about people's personal experiences with it. One hint in the release notes is that some, but not all, old plugins work in the new version...
I wouldn't be surprised if a decent amout of people were still running Windows XP, esp. on old hardware.
1.6 is the last version before the big rework.