John Peter

Hooray! Thank you Null54 and you are correct on ALL points. I moved the kb_lens.dll to a new subfolder I created called Photos. (I slipped up and forgot to make Lens Distortion as a sub-folder of Photos . I didn't even have to re-boot or re-logon to my Windows 10 Pro computer. I simply started photos.net and the desired plugin was found where you instructed. I'll show some very early experimental results, from a highly distorted original drone photo of the skyscrapers of Hong Kong. Three photos: one with several minus compounded corrective applications; the original, and one with several plus compounded corrective applications. And this forum is AWESOME. The response rate is very, very encouraging to this newbie, and exciting.

Thank you both for the prompt replies. Shortly after posting my appeal for assistance, I found an fully packaged (with .exe installer) collection of plugins called BoltBaitPack69, intended for version 5 of paint.net. That worked, and the numerous plugins are accessible in my paint.net (from Microsoft Store) application. I later noticed that the act of installing BoltBaitPack69 created three folders under my Documents\paint.net App files folder: Effects, Palettes, and Shapes. ( I had manually created the Documents sub-folder paint.net App files 3 hours earlier.) The BoltBaitPack69 installation process populated the Effects folder with 40 dlls, and they seem to work. I copied the kb_lens.dll that I need into that same Effects folder and it is nowhere to be found in the paint.net (version 5.11.x) application. There's no surprise in that as kb_lens.dll was written 16 years ago for an older paint.net (presumably version 4.x). Moreover, there are now numerous references to paint.net in my registry, but none of them match the two registry entries mentioned in the guidelines you identified. Unfortunately, the only plugin related to fisheye correction, provided by BoltBaitPack69 seems to be "Bulge" and it seems inappropriate. I'll try again soon, with that. If you care to correct this newbie's opinion that there is an abyss between paint.net version 4 plugins and the new paint.net version 5.11.x, please advise.

Thank you for all the previous advisories, but they all seem to be obsolete for me, a newbie to paint.net. I just purchased paint.net (version 5.11.xxxx) from the Microsoft store, and it automatically installed to ONE PROFILE only on my Windows 10 Pro computer that I call "CARBON." Paint.net has an icon in the one profile's start menu and indeed the program runs and saves files and seems to operate OK. But right-clicking on the icon yields no "properties" and no "location." So I found it the old fashioned way... by global search using file explorer... and it is up the tree in AppData\Local\Packages\dotPDNLLC.paint.net_h55e3w7q8jbva Inside that folder are many folders but no "Effects" folder. Nor can I find any executable file. Can anyone advise, on where to install a plugin dll for barrel distortion correction? I have found an offering called "kb_lens.zip"