Hi.
You should not have problems with the preferences.txt.
But, you can make a copy of it for backup if you are not sure about the update results.
Those plugins are part of Wings3D, except by my Curve Tools. But, I keep making versions available for the latest Wings3D versions. So, just check its download link in my thread.
There is also an update/patch for Yafaray which you can find in the Patches section inside de Bug Report here at the forum.
You should not have problems with the preferences.txt.
But, you can make a copy of it for backup if you are not sure about the update results.
Those plugins are part of Wings3D, except by my Curve Tools. But, I keep making versions available for the latest Wings3D versions. So, just check its download link in my thread.
There is also an update/patch for Yafaray which you can find in the Patches section inside de Bug Report here at the forum.