im still using 5.4c version with old drivers,stable no problem. do i need new version? for polaris cards win10? thanks
The short answer is NO if you are happy with what you have now.
YES, if you plan to, add new hardware or upgrade the drivers.
Long answer: The new versions usually add support to the newest hardware and the new drivers required for it. Also, they could add new features, adding support for more epochs, or slight hashrate improvement in new or old hardware. For more info on each version need to read release notes or the first page of the dev's post.
P.S.
[moderator's note: consecutive posts merged]
I do not agree with the moderator's decision to merge my previews posts from yesterday because they were answers for two different problems not connected to each other. When the answers are to different persons for the same issue is OK to merge them, but is better and more clear to keep them separated when are no connected questions. Before the moderators make automatic corrections, they have to read the posts and then take action.