As usual, you can either use the built-in updater from the Utilities menu, or you can download and install directly from the website: http://www.getpaint.net/. There’s no need to worry about removing the old version; that is all handled automatically.
This update fixes some issues with the fault-tolerant save functionality introduced in 3.5.7.
Oh, and I’d like to point out that even with these fixes, the original “mission” of fault-tolerant saving was being upheld. In previous versions, if errors or crashes happened while saving, the original file would be lost (honestly it’s a bit inexcusable that I waited so long to fix this!). In v3.5.7 it had some trouble saving the new contents in some situations, but the overall strategy was working because the original contents were still there. Since saving is such an important task to have working correctly, I’ve decided to roll out this update very quickly without attempting to roll in any other improvements.
Changes since v3.5.7:
- Fixed: Saving to a folder that has been moved or renamed will display an error instead of crashing (regression from 3.5.6)
- Fixed: Saving to a Sharepoint site will now work (regression from 3.5.6)
- Fixed: Saving to a file that is marked as read only will now give an error instead of crashing (regression from 3.5.6)
- Fixed: General reliability and correctness improvements to fault-tolerant saving
Enjoy!
paint.net blog 
Consider yourself worshiped!
For what it’s worth, I got a crash while trying to auto update from 3.5.6.
Well, please send it in (it has an e-mail address inside).
Hmm, does Paint.NET log / report crashes?
What happened is that the progress bar filled up, then the app simply stopped responding, and after a while I killed it. So I’m not sure I’ve got anything to send (but if I do, let me know).
Since then, I just did a full install of 3.5.8, which worked properly.
Stop wasting you’re time, paint.net blows!
Not until “you’re” grammar makes sense.
Your product helps me a lot!