not sure if anyone is still using this plugin, but I can confirm it does still work in PDN version 5.0.9 and is very useful. i've identified a small bug in exporting frames that only occurs if you have a "." in your username. The work around is to go into your C:\Users directory and create a new folder with no "." in the name and then create a subfolder to extract frames to. On the subfolder, right-click and select properties. then go to the security tab, select "Everyone" or "Users" in the Group or Usernames list, and click "Edit". Check the box next to "Modify" and then click Apply. This will allow the folder to be written to without having to run Paint.NET as admin. This is necessary because the folder you created is technically in a system directory (C:\Users). Then when exporting frames, export them into this directory.
The symptom of having run into this bug is that you receive this error when you click Export Frames after selecting the export location:
The error appears to be caused by this code in the plugin:
It appears to look for the "." in the filename in order to sequentially number the frames. However if you have a "." in your username it will add the number before it rather than just before the file extension since is looks at the whole file path, causing the save operation to fail because no folder by that name exists. I'm pretty sure the fix is to somehow separate the file path and the file name into separate variables so the filename may be modified freely, then concatenate them at the end of the operation before writing but I've never worked with PDN plugins or .NET before; i just figured out how to install codelab this morning.
Just wanted to leave this here in case someone runs into this issue. The plugin is awesome.